21513153360 has 80 divisors (see below), whose sum is σ = 67630135680. Its totient is φ = 5656035840.

The previous prime is 21513153341. The next prime is 21513153383. The reversal of 21513153360 is 6335131512.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 614215 + ... + 648294.

It is an arithmetic number, because the mean of its divisors is an integer number (845376696).

Almost surely, 2^21513153360 is an apocalyptic number.

21513153360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21513153360 is an abundant number, since it is smaller than the sum of its proper divisors (46116982320).

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

21513153360 is a wasteful number, since it uses less digits than its factorization.

21513153360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1262596 (or 1262590 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

Adding to 21513153360 its reverse (6335131512), we get a palindrome (27848284872).

The spelling of 21513153360 in words is "twenty-one billion, five hundred thirteen million, one hundred fifty-three thousand, three hundred sixty".