21513332430 has 32 divisors (see below), whose sum is σ = 57368887200. Its totient is φ = 5736888576.

The previous prime is 21513332339. The next prime is 21513332437. The reversal of 21513332430 is 3423331512.

21513332430 is a `hidden beast` number, since 215 + 13 + 3 + 3 + 2 + 430 = 666.

21513332430 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21513332394 and 21513332403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513332437) 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, 39839235 + ... + 39839774.

It is an arithmetic number, because the mean of its divisors is an integer number (1792777725).

Almost surely, 2^21513332430 is an apocalyptic number.

21513332430 is an abundant number, since it is smaller than the sum of its proper divisors (35855554770).

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

21513332430 is a wasteful number, since it uses less digits than its factorization.

21513332430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79679025 (or 79679019 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21513332430 its reverse (3423331512), we get a palindrome (24936663942).

The spelling of 21513332430 in words is "twenty-one billion, five hundred thirteen million, three hundred thirty-two thousand, four hundred thirty".