21985248104 has 16 divisors (see below), whose sum is σ = 41399263620. Its totient is φ = 10945444480.

The previous prime is 21985248097. The next prime is 21985248151. The reversal of 21985248104 is 40184258912.

It can be written as a sum of positive squares in 2 ways, for example, as 16887002500 + 5098245604 = 129950^2 + 71402^2 .

It is a super-2 number, since 2×21985248104² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5895467 + ... + 5899194.

Almost surely, 2^21985248104 is an apocalyptic number.

It is an amenable number.

21985248104 is a deficient number, since it is larger than the sum of its proper divisors (19414015516).

21985248104 is a wasteful number, since it uses less digits than its factorization.

21985248104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11794900 (or 11794896 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 21985248104 in words is "twenty-one billion, nine hundred eighty-five million, two hundred forty-eight thousand, one hundred four".