21102132331 has 16 divisors (see below), whose sum is σ = 24416289216. Its totient is φ = 17864211456.

The previous prime is 21102132319. The next prime is 21102132341. The reversal of 21102132331 is 13323120112.

It is not a de Polignac number, because 21102132331 - 2¹⁵ = 21102099563 is a prime.

It is a super-2 number, since 2×21102132331² (a number of 21 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 = 21102132299 and 21102132308.

It is not an unprimeable number, because it can be changed into a prime (21102132341) 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, 133075 + ... + 244771.

It is an arithmetic number, because the mean of its divisors is an integer number (1526018076).

Almost surely, 2^21102132331 is an apocalyptic number.

21102132331 is a deficient number, since it is larger than the sum of its proper divisors (3314156885).

21102132331 is a wasteful number, since it uses less digits than its factorization.

21102132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112038.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21102132331 its reverse (13323120112), we get a palindrome (34425252443).

The spelling of 21102132331 in words is "twenty-one billion, one hundred two million, one hundred thirty-two thousand, three hundred thirty-one".