21130232331 has 32 divisors (see below), whose sum is σ = 32147781120. Its totient is φ = 12229876224.

The previous prime is 21130232309. The next prime is 21130232377. The reversal of 21130232331 is 13323203112.

It is not a de Polignac number, because 21130232331 - 2⁹ = 21130231819 is a prime.

It is a super-2 number, since 2×21130232331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21130232298 and 21130232307.

It is not an unprimeable number, because it can be changed into a prime (21130232731) 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, 1023396 + ... + 1043838.

It is an arithmetic number, because the mean of its divisors is an integer number (1004618160).

Almost surely, 2^21130232331 is an apocalyptic number.

21130232331 is a deficient number, since it is larger than the sum of its proper divisors (11017548789).

21130232331 is a wasteful number, since it uses less digits than its factorization.

21130232331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22035.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21130232331 its reverse (13323203112), we get a palindrome (34453435443).

The spelling of 21130232331 in words is "twenty-one billion, one hundred thirty million, two hundred thirty-two thousand, three hundred thirty-one".