21023102310 has 64 divisors (see below), whose sum is σ = 57800577024. Its totient is φ = 4793846400.

The previous prime is 21023102297. The next prime is 21023102329. The reversal of 21023102310 is 1320132012.

It is a super-2 number, since 2×21023102310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

21023102310 is a modest number, since divided by 23102310 gives 210 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 21023102310.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30486 + ... + 207305.

It is an arithmetic number, because the mean of its divisors is an integer number (903134016).

Almost surely, 2^21023102310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023102310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28900288512).

21023102310 is an abundant number, since it is smaller than the sum of its proper divisors (36777474714).

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

21023102310 is a wasteful number, since it uses less digits than its factorization.

21023102310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238229.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21023102310 its reverse (1320132012), we get a palindrome (22343234322).

The spelling of 21023102310 in words is "twenty-one billion, twenty-three million, one hundred two thousand, three hundred ten".