21626202064251 has 8 divisors (see below), whose sum is σ = 28835179980624. Its totient is φ = 14417346095360.

The previous prime is 21626202064249. The next prime is 21626202064267. The reversal of 21626202064251 is 15246020262612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21626202064251 - 2¹ = 21626202064249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21626202062251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30072270 + ... + 30783011.

It is an arithmetic number, because the mean of its divisors is an integer number (3604397497578).

Almost surely, 2^{21626202064251} is an apocalyptic number.

21626202064251 is a deficient number, since it is larger than the sum of its proper divisors (7208977916373).

21626202064251 is a wasteful number, since it uses less digits than its factorization.

21626202064251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60973741.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 21626202064251 in words is "twenty-one trillion, six hundred twenty-six billion, two hundred two million, sixty-four thousand, two hundred fifty-one".