21985273458 has 12 divisors (see below), whose sum is σ = 47634759198. Its totient is φ = 7328424480.

The previous prime is 21985273451. The next prime is 21985273487. The reversal of 21985273458 is 85437258912.

21985273458 is a `hidden beast` number, since 21 + 98 + 527 + 3 + 4 + 5 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19628850609 + 2356422849 = 140103^2 + 48543^2 .

It is not an unprimeable number, because it can be changed into a prime (21985273451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610702023 + ... + 610702058.

Almost surely, 2^21985273458 is an apocalyptic number.

21985273458 is an abundant number, since it is smaller than the sum of its proper divisors (25649485740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21985273458 is a wasteful number, since it uses less digits than its factorization.

21985273458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221404089 (or 1221404086 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 21985273458 in words is "twenty-one billion, nine hundred eighty-five million, two hundred seventy-three thousand, four hundred fifty-eight".