731111022100021 has 16 divisors (see below), whose sum is σ = 767501070231168. Its totient is φ = 695811409286400.

The previous prime is 731111022099959. The next prime is 731111022100049. The reversal of 731111022100021 is 120001220111137.

731111022100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-731111022100021 is a prime.

It is a super-2 number, since 2×731111022100021² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 731111022099965 and 731111022100001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731111022100621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291702000 + ... + 1292267881.

It is an arithmetic number, because the mean of its divisors is an integer number (47968816889448).

Almost surely, 2^{731111022100021} is an apocalyptic number.

It is an amenable number.

731111022100021 is a deficient number, since it is larger than the sum of its proper divisors (36390048131147).

731111022100021 is a wasteful number, since it uses less digits than its factorization.

731111022100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583970092.

The product of its (nonzero) digits is 168, while the sum is 22.

Adding to 731111022100021 its reverse (120001220111137), we get a palindrome (851112242211158).

The spelling of 731111022100021 in words is "seven hundred thirty-one trillion, one hundred eleven billion, twenty-two million, one hundred thousand, twenty-one".