21551403125244 has 24 divisors (see below), whose sum is σ = 50378538947968. Its totient is φ = 7170667948080.

The previous prime is 21551403125221. The next prime is 21551403125267. The reversal of 21551403125244 is 44252130415512.

It is an interprime number because it is at equal distance from previous prime (21551403125221) and next prime (21551403125267).

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, 1641629872 + ... + 1641642999.

Almost surely, 2^{21551403125244} is an apocalyptic number.

It is an amenable number.

21551403125244 is an abundant number, since it is smaller than the sum of its proper divisors (28827135822724).

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

21551403125244 is a wasteful number, since it uses less digits than its factorization.

21551403125244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3283273425 (or 3283273423 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 39.

The spelling of 21551403125244 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred three million, one hundred twenty-five thousand, two hundred forty-four".