21221525625055 has 12 divisors (see below), whose sum is σ = 29623517403480. Its totient is φ = 14551903285584.

The previous prime is 21221525625043. The next prime is 21221525625067. The reversal of 21221525625055 is 55052652512212.

It is an interprime number because it is at equal distance from previous prime (21221525625043) and next prime (21221525625067).

It is not a de Polignac number, because 21221525625055 - 2¹⁵ = 21221525592287 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43309235725 + ... + 43309236214.

It is an arithmetic number, because the mean of its divisors is an integer number (2468626450290).

Almost surely, 2^{21221525625055} is an apocalyptic number.

21221525625055 is a deficient number, since it is larger than the sum of its proper divisors (8401991778425).

21221525625055 is an equidigital number, since it uses as much as digits as its factorization.

21221525625055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86618471958 (or 86618471951 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 43.

The spelling of 21221525625055 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-five million, six hundred twenty-five thousand, fifty-five".