21125126251124 has 24 divisors (see below), whose sum is σ = 42250923371328. Its totient is φ = 9053481778560.

The previous prime is 21125126251093. The next prime is 21125126251133. The reversal of 21125126251124 is 42115262152112.

21125126251124 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21125126251124² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4185482 + ... + 7731009.

It is an arithmetic number, because the mean of its divisors is an integer number (1760455140472).

Almost surely, 2^{21125126251124} is an apocalyptic number.

It is an amenable number.

21125126251124 is an abundant number, since it is smaller than the sum of its proper divisors (21125797120204).

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

21125126251124 is a wasteful number, since it uses less digits than its factorization.

21125126251124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11979815 (or 11979813 counting only the distinct ones).

The product of its digits is 19200, while the sum is 35.

The spelling of 21125126251124 in words is "twenty-one trillion, one hundred twenty-five billion, one hundred twenty-six million, two hundred fifty-one thousand, one hundred twenty-four".