21373577155024 has 10 divisors (see below), whose sum is σ = 41411305737890. Its totient is φ = 10686788577504.

The previous prime is 21373577155009. The next prime is 21373577155027. The reversal of 21373577155024 is 42055177537312.

It can be written as a sum of positive squares in only one way, i.e., 18867903438400 + 2505673716624 = 4343720^2 + 1582932^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21373577155027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667924286079 + ... + 667924286110.

It is an arithmetic number, because the mean of its divisors is an integer number (4141130573789).

Almost surely, 2^{21373577155024} is an apocalyptic number.

It is an amenable number.

21373577155024 is a deficient number, since it is larger than the sum of its proper divisors (20037728582866).

21373577155024 is a wasteful number, since it uses less digits than its factorization.

21373577155024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335848572197 (or 1335848572191 counting only the distinct ones).

The product of its (nonzero) digits is 6174000, while the sum is 52.

The spelling of 21373577155024 in words is "twenty-one trillion, three hundred seventy-three billion, five hundred seventy-seven million, one hundred fifty-five thousand, twenty-four".