21310232310 has 24 divisors (see below), whose sum is σ = 55406604240. Its totient is φ = 5682728592.

The previous prime is 21310232303. The next prime is 21310232387. The reversal of 21310232310 is 1323201312.

21310232310 is a `hidden beast` number, since 21 + 310 + 2 + 323 + 10 = 666.

It is a super-2 number, since 2×21310232310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118390090 + ... + 118390269.

It is an arithmetic number, because the mean of its divisors is an integer number (2308608510).

Almost surely, 2^21310232310 is an apocalyptic number.

21310232310 is an abundant number, since it is smaller than the sum of its proper divisors (34096371930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21310232310 is a wasteful number, since it uses less digits than its factorization.

21310232310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236780372 (or 236780369 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21310232310 its reverse (1323201312), we get a palindrome (22633433622).

The spelling of 21310232310 in words is "twenty-one billion, three hundred ten million, two hundred thirty-two thousand, three hundred ten".