21170076473820 has 48 divisors (see below), whose sum is σ = 59294955162240. Its totient is φ = 5643568865856.

The previous prime is 21170076473813. The next prime is 21170076473891. The reversal of 21170076473820 is 2837467007112.

It is a self number, because there is not a number n which added to its sum of digits gives 21170076473820.

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, 55585530 + ... + 55965089.

It is an arithmetic number, because the mean of its divisors is an integer number (1235311565880).

Almost surely, 2^{21170076473820} is an apocalyptic number.

21170076473820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21170076473820 is an abundant number, since it is smaller than the sum of its proper divisors (38124878688420).

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

21170076473820 is a wasteful number, since it uses less digits than its factorization.

21170076473820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111553794 (or 111553792 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 48.

The spelling of 21170076473820 in words is "twenty-one trillion, one hundred seventy billion, seventy-six million, four hundred seventy-three thousand, eight hundred twenty".