21255605106626 has 12 divisors (see below), whose sum is σ = 35045398502646. Its totient is φ = 9661638684720.

The previous prime is 21255605106611. The next prime is 21255605106649. The reversal of 21255605106626 is 62660150655212.

It can be written as a sum of positive squares in only one way, i.e., 17805488319025 + 3450116787601 = 4219655^2 + 1857449^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43916539235 + ... + 43916539718.

Almost surely, 2^{21255605106626} is an apocalyptic number.

21255605106626 is a deficient number, since it is larger than the sum of its proper divisors (13789793396020).

21255605106626 is a wasteful number, since it uses less digits than its factorization.

21255605106626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87833078977 (or 87833078966 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 21255605106626 in words is "twenty-one trillion, two hundred fifty-five billion, six hundred five million, one hundred six thousand, six hundred twenty-six".