21070839636444 has 48 divisors (see below), whose sum is σ = 53260535394080. Its totient is φ = 6483335264640.

The previous prime is 21070839636437. The next prime is 21070839636491. The reversal of 21070839636444 is 44463693807012.

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, 399587497 + ... + 399640224.

Almost surely, 2^{21070839636444} is an apocalyptic number.

It is an amenable number.

21070839636444 is an abundant number, since it is smaller than the sum of its proper divisors (32189695757636).

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

21070839636444 is a wasteful number, since it uses less digits than its factorization.

21070839636444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799227767 (or 799227739 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 57.

The spelling of 21070839636444 in words is "twenty-one trillion, seventy billion, eight hundred thirty-nine million, six hundred thirty-six thousand, four hundred forty-four".