21355768860580 has 96 divisors (see below), whose sum is σ = 55914936134400. Its totient is φ = 6656147066880.

The previous prime is 21355768860571. The next prime is 21355768860583. The reversal of 21355768860580 is 8506886755312.

It is not an unprimeable number, because it can be changed into a prime (21355768860583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57214396 + ... + 57586444.

It is an arithmetic number, because the mean of its divisors is an integer number (582447251400).

Almost surely, 2^{21355768860580} is an apocalyptic number.

21355768860580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355768860580 is an abundant number, since it is smaller than the sum of its proper divisors (34559167273820).

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

21355768860580 is a wasteful number, since it uses less digits than its factorization.

21355768860580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409349 (or 409347 counting only the distinct ones).

The product of its (nonzero) digits is 96768000, while the sum is 64.

The spelling of 21355768860580 in words is "twenty-one trillion, three hundred fifty-five billion, seven hundred sixty-eight million, eight hundred sixty thousand, five hundred eighty".