21577562353212 has 24 divisors (see below), whose sum is σ = 50424747569616. Its totient is φ = 7181506201728.

The previous prime is 21577562353211. The next prime is 21577562353219. The reversal of 21577562353212 is 21235326577512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21577562353211) 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, 1376814673 + ... + 1376830344.

It is an arithmetic number, because the mean of its divisors is an integer number (2101031148734).

Almost surely, 2^{21577562353212} is an apocalyptic number.

It is an amenable number.

21577562353212 is an abundant number, since it is smaller than the sum of its proper divisors (28847185216404).

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

21577562353212 is a wasteful number, since it uses less digits than its factorization.

21577562353212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753645677 (or 2753645675 counting only the distinct ones).

The product of its digits is 5292000, while the sum is 51.

The spelling of 21577562353212 in words is "twenty-one trillion, five hundred seventy-seven billion, five hundred sixty-two million, three hundred fifty-three thousand, two hundred twelve".