21670555520560 has 20 divisors (see below), whose sum is σ = 50384041585488. Its totient is φ = 8668222208192.

The previous prime is 21670555520473. The next prime is 21670555520641. The reversal of 21670555520560 is 6502555507612.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×21670555520560² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135440971924 + ... + 135440972083.

Almost surely, 2^{21670555520560} is an apocalyptic number.

21670555520560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21670555520560 is an abundant number, since it is smaller than the sum of its proper divisors (28713486064928).

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

21670555520560 is a wasteful number, since it uses less digits than its factorization.

21670555520560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270881944020 (or 270881944014 counting only the distinct ones).

The product of its (nonzero) digits is 3150000, while the sum is 49.

The spelling of 21670555520560 in words is "twenty-one trillion, six hundred seventy billion, five hundred fifty-five million, five hundred twenty thousand, five hundred sixty".