21310065524 has 144 divisors (see below), whose sum is σ = 45898151040. Its totient is φ = 8607456000.

The previous prime is 21310065523. The next prime is 21310065533. The reversal of 21310065524 is 42556001312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310065523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11208974 + ... + 11210874.

It is an arithmetic number, because the mean of its divisors is an integer number (318737160).

Almost surely, 2^21310065524 is an apocalyptic number.

It is an amenable number.

21310065524 is an abundant number, since it is smaller than the sum of its proper divisors (24588085516).

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

21310065524 is a wasteful number, since it uses less digits than its factorization.

21310065524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2009 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21310065524 its reverse (42556001312), we get a palindrome (63866066836).

The spelling of 21310065524 in words is "twenty-one billion, three hundred ten million, sixty-five thousand, five hundred twenty-four".