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1221122021 = 7376746309
BaseRepresentation
bin100100011001000…
…1101011111100101
310011002202102111112
41020302031133211
510000101401041
6321100514405
742155236340
oct11062153745
93132672445
101221122021
11577323059
122a0b4ba05
13165cab512
14b826b457
157230ddeb
hex48c8d7e5

1221122021 has 8 divisors (see below), whose sum is σ = 1395968640. Its totient is φ = 1046375568.

The previous prime is 1221122009. The next prime is 1221122059. The reversal of 1221122021 is 1202211221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221122021 - 230 = 147380197 is a prime.

It is a super-2 number, since 2×12211220212 = 2982277980342248882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221121987 and 1221122005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3215 + ... + 49523.

It is an arithmetic number, because the mean of its divisors is an integer number (174496080).

Almost surely, 21221122021 is an apocalyptic number.

It is an amenable number.

1221122021 is a deficient number, since it is larger than the sum of its proper divisors (174846619).

1221122021 is an equidigital number, since it uses as much as digits as its factorization.

1221122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50083.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221122021 is about 34944.5563857949. The cubic root of 1221122021 is about 1068.8572015810.

Adding to 1221122021 its reverse (1202211221), we get a palindrome (2423333242).

The spelling of 1221122021 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, twenty-one".

Divisors: 1 7 3767 26369 46309 324163 174446003 1221122021