21071710020560 has 80 divisors (see below), whose sum is σ = 50273085513024. Its totient is φ = 8209345622016.

The previous prime is 21071710020521. The next prime is 21071710020577. The reversal of 21071710020560 is 6502001717012.

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

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, 7462022 + ... + 9890661.

Almost surely, 2^{21071710020560} is an apocalyptic number.

21071710020560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21071710020560 is an abundant number, since it is smaller than the sum of its proper divisors (29201375492464).

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

21071710020560 is a wasteful number, since it uses less digits than its factorization.

21071710020560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17353092 (or 17353086 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

Adding to 21071710020560 its reverse (6502001717012), we get a palindrome (27573711737572).

The spelling of 21071710020560 in words is "twenty-one trillion, seventy-one billion, seven hundred ten million, twenty thousand, five hundred sixty".