21191570960 has 120 divisors (see below), whose sum is σ = 60331317120. Its totient is φ = 6883252992.

The previous prime is 21191570951. The next prime is 21191570969. The reversal of 21191570960 is 6907519112.

It is an interprime number because it is at equal distance from previous prime (21191570951) and next prime (21191570969).

It is not an unprimeable number, because it can be changed into a prime (21191570969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67784 + ... + 216743.

It is an arithmetic number, because the mean of its divisors is an integer number (502760976).

Almost surely, 2^21191570960 is an apocalyptic number.

21191570960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21191570960 is an abundant number, since it is smaller than the sum of its proper divisors (39139746160).

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

21191570960 is a wasteful number, since it uses less digits than its factorization.

21191570960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284573 (or 284560 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 41.

The spelling of 21191570960 in words is "twenty-one billion, one hundred ninety-one million, five hundred seventy thousand, nine hundred sixty".