21255446104 has 16 divisors (see below), whose sum is σ = 39855594600. Its totient is φ = 10627287552.

The previous prime is 21255446089. The next prime is 21255446123. The reversal of 21255446104 is 40164455212.

It is a self number, because there is not a number n which added to its sum of digits gives 21255446104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259459 + ... + 331405.

Almost surely, 2^21255446104 is an apocalyptic number.

It is an amenable number.

21255446104 is a deficient number, since it is larger than the sum of its proper divisors (18600148496).

21255446104 is a wasteful number, since it uses less digits than its factorization.

21255446104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108882 (or 108878 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The spelling of 21255446104 in words is "twenty-one billion, two hundred fifty-five million, four hundred forty-six thousand, one hundred four".