21221127568375 has 64 divisors (see below), whose sum is σ = 30494940383232. Its totient is φ = 14442277920000.

The previous prime is 21221127568307. The next prime is 21221127568409. The reversal of 21221127568375 is 57386572112212.

It is not a de Polignac number, because 21221127568375 - 2²¹ = 21221125471223 is a prime.

It is a Duffinian number.

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, 641434584 + ... + 641467666.

It is an arithmetic number, because the mean of its divisors is an integer number (476483443488).

Almost surely, 2^{21221127568375} is an apocalyptic number.

21221127568375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21221127568375 is a deficient number, since it is larger than the sum of its proper divisors (9273812814857).

21221127568375 is a wasteful number, since it uses less digits than its factorization.

21221127568375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38593 (or 38583 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 52.

The spelling of 21221127568375 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-seven million, five hundred sixty-eight thousand, three hundred seventy-five".