21970236401808 has 40 divisors (see below), whose sum is σ = 56956996879008. Its totient is φ = 7297534348032.

The previous prime is 21970236401783. The next prime is 21970236401809. The reversal of 21970236401808 is 80810463207912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21970236401809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 808667085 + ... + 808694252.

Almost surely, 2^{21970236401808} is an apocalyptic number.

It is an amenable number.

21970236401808 is an abundant number, since it is smaller than the sum of its proper divisors (34986760477200).

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

21970236401808 is a wasteful number, since it uses less digits than its factorization.

21970236401808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617361631 (or 1617361625 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 21970236401808 in words is "twenty-one trillion, nine hundred seventy billion, two hundred thirty-six million, four hundred one thousand, eight hundred eight".