21112616560 has 80 divisors (see below), whose sum is σ = 56936641536. Its totient is φ = 7130559744.

The previous prime is 21112616521. The next prime is 21112616561. The reversal of 21112616560 is 6561621112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112616561) 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, 243832 + ... + 318871.

Almost surely, 2^21112616560 is an apocalyptic number.

21112616560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112616560 is an abundant number, since it is smaller than the sum of its proper divisors (35824024976).

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

21112616560 is a wasteful number, since it uses less digits than its factorization.

21112616560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562790 (or 562784 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 21112616560 in words is "twenty-one billion, one hundred twelve million, six hundred sixteen thousand, five hundred sixty".