21064860626 has 4 divisors (see below), whose sum is σ = 31597290942. Its totient is φ = 10532430312.

The previous prime is 21064860617. The next prime is 21064860631. The reversal of 21064860626 is 62606846012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21058363225 + 6497401 = 145115^2 + 2549^2 .

It is a super-2 number, since 2×21064860626² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5266215155 + ... + 5266215158.

Almost surely, 2^21064860626 is an apocalyptic number.

21064860626 is a deficient number, since it is larger than the sum of its proper divisors (10532430316).

21064860626 is a wasteful number, since it uses less digits than its factorization.

21064860626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532430315.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 21064860626 in words is "twenty-one billion, sixty-four million, eight hundred sixty thousand, six hundred twenty-six".