21244256125 has 64 divisors (see below), whose sum is σ = 28700904960. Its totient is φ = 15641472000.

The previous prime is 21244256093. The next prime is 21244256147. The reversal of 21244256125 is 52165244212.

It is not a de Polignac number, because 21244256125 - 2⁵ = 21244256093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20971119 + ... + 20972131.

It is an arithmetic number, because the mean of its divisors is an integer number (448451640).

Almost surely, 2^21244256125 is an apocalyptic number.

21244256125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21244256125 is a deficient number, since it is larger than the sum of its proper divisors (7456648835).

21244256125 is a wasteful number, since it uses less digits than its factorization.

21244256125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255 (or 1245 counting only the distinct ones).

The product of its digits is 38400, while the sum is 34.

The spelling of 21244256125 in words is "twenty-one billion, two hundred forty-four million, two hundred fifty-six thousand, one hundred twenty-five".