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21221222222 = 210610611111
BaseRepresentation
bin10011110000111000…
…100010011101001110
32000202221110210012102
4103300320202131032
5321430113102342
613425432235102
71350611261354
oct236070423516
960687423172
1021221222222
118aaa910392
124142b3ba92
1320026bc935
14105457b7d4
15843099832
hex4f0e2274e

21221222222 has 4 divisors (see below), whose sum is σ = 31831833336. Its totient is φ = 10610611110.

The previous prime is 21221222221. The next prime is 21221222237. The reversal of 21221222222 is 22222212212.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×212212222224 (a number of 42 digits) contains 4444 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21221222194 and 21221222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305305554 + ... + 5305305557.

It is an arithmetic number, because the mean of its divisors is an integer number (7957958334).

Almost surely, 221221222222 is an apocalyptic number.

21221222222 is a deficient number, since it is larger than the sum of its proper divisors (10610611114).

21221222222 is a wasteful number, since it uses less digits than its factorization.

21221222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610611113.

The product of its digits is 512, while the sum is 20.

Adding to 21221222222 its reverse (22222212212), we get a palindrome (43443434434).

The spelling of 21221222222 in words is "twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".

Divisors: 1 2 10610611111 21221222222