21100321131321 has 32 divisors (see below), whose sum is σ = 28441835769600. Its totient is φ = 13913793121536.

The previous prime is 21100321131301. The next prime is 21100321131347. The reversal of 21100321131321 is 12313112300112.

It is not a de Polignac number, because 21100321131321 - 2²¹ = 21100319034169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21100321131301) 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, 145409815 + ... + 145554851.

It is an arithmetic number, because the mean of its divisors is an integer number (888807367800).

Almost surely, 2^{21100321131321} is an apocalyptic number.

It is an amenable number.

21100321131321 is a deficient number, since it is larger than the sum of its proper divisors (7341514638279).

21100321131321 is a wasteful number, since it uses less digits than its factorization.

21100321131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146673.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 21100321131321 its reverse (12313112300112), we get a palindrome (33413433431433).

The spelling of 21100321131321 in words is "twenty-one trillion, one hundred billion, three hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".