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21001200222 = 23293712592591
BaseRepresentation
bin10011100011110001…
…001110001001011110
32000012121110111202110
4103203301032021132
5321002301401342
613351532334450
71342300153662
oct234361161136
960177414673
1021001200222
1189a76a2622
1240a1314426
131c98c451c2
1410332668a2
1582dad7c9c
hex4e3c4e25e

21001200222 has 64 divisors (see below), whose sum is σ = 44677785600. Its totient is φ = 6568571520.

The previous prime is 21001200221. The next prime is 21001200281. The reversal of 21001200222 is 22200210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001200198 and 21001200207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001200221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8104147 + ... + 8106737.

It is an arithmetic number, because the mean of its divisors is an integer number (698090400).

Almost surely, 221001200222 is an apocalyptic number.

21001200222 is an abundant number, since it is smaller than the sum of its proper divisors (23676585378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001200222 is a wasteful number, since it uses less digits than its factorization.

21001200222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21001200222 its reverse (22200210012), we get a palindrome (43201410234).

The spelling of 21001200222 in words is "twenty-one billion, one million, two hundred thousand, two hundred twenty-two".

Divisors: 1 2 3 6 29 37 58 74 87 111 174 222 1073 1259 2146 2518 2591 3219 3777 5182 6438 7554 7773 15546 36511 46583 73022 75139 93166 95867 109533 139749 150278 191734 219066 225417 279498 287601 450834 575202 1350907 2701814 2780143 3262069 4052721 5560286 6524138 8105442 8340429 9786207 16680858 19572414 94600001 120696553 189200002 241393106 283800003 362089659 567600006 724179318 3500200037 7000400074 10500600111 21001200222