21513101360 has 40 divisors (see below), whose sum is σ = 50579976960. Its totient is φ = 8508549632.

The previous prime is 21513101347. The next prime is 21513101377. The reversal of 21513101360 is 6310131512.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1503632 + ... + 1517871.

It is an arithmetic number, because the mean of its divisors is an integer number (1264499424).

Almost surely, 2^21513101360 is an apocalyptic number.

21513101360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21513101360 is an abundant number, since it is smaller than the sum of its proper divisors (29066875600).

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

21513101360 is a wasteful number, since it uses less digits than its factorization.

21513101360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021605 (or 3021599 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 21513101360 its reverse (6310131512), we get a palindrome (27823232872).

The spelling of 21513101360 in words is "twenty-one billion, five hundred thirteen million, one hundred one thousand, three hundred sixty".