21420624063660 has 48 divisors (see below), whose sum is σ = 59987657159136. Its totient is φ = 5711222628352.

The previous prime is 21420624063617. The next prime is 21420624063719. The reversal of 21420624063660 is 6636042602412.

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, 29127189 + ... + 29853548.

It is an arithmetic number, because the mean of its divisors is an integer number (1249742857482).

Almost surely, 2^{21420624063660} is an apocalyptic number.

21420624063660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420624063660 is an abundant number, since it is smaller than the sum of its proper divisors (38567033095476).

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

21420624063660 is a wasteful number, since it uses less digits than its factorization.

21420624063660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58986802 (or 58986800 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 21420624063660 in words is "twenty-one trillion, four hundred twenty billion, six hundred twenty-four million, sixty-three thousand, six hundred sixty".