21315010524 has 48 divisors (see below), whose sum is σ = 52293669120. Its totient is φ = 6744200320.

The previous prime is 21315010523. The next prime is 21315010699. The reversal of 21315010524 is 42501051312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21315010494 and 21315010503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315010523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258609 + ... + 330920.

It is an arithmetic number, because the mean of its divisors is an integer number (1089451440).

Almost surely, 2^21315010524 is an apocalyptic number.

It is an amenable number.

21315010524 is an abundant number, since it is smaller than the sum of its proper divisors (30978658596).

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

21315010524 is a wasteful number, since it uses less digits than its factorization.

21315010524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589690 (or 589688 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21315010524 its reverse (42501051312), we get a palindrome (63816061836).

The spelling of 21315010524 in words is "twenty-one billion, three hundred fifteen million, ten thousand, five hundred twenty-four".