21289375242 has 12 divisors (see below), whose sum is σ = 46126979730. Its totient is φ = 7096458408.

The previous prime is 21289375231. The next prime is 21289375267. The reversal of 21289375242 is 24257398212.

21289375242 is a `hidden beast` number, since 2 + 12 + 89 + 37 + 524 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16330539681 + 4958835561 = 127791^2 + 70419^2 .

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, 591371517 + ... + 591371552.

Almost surely, 2^21289375242 is an apocalyptic number.

21289375242 is an abundant number, since it is smaller than the sum of its proper divisors (24837604488).

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

21289375242 is a wasteful number, since it uses less digits than its factorization.

21289375242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182743077 (or 1182743074 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 21289375242 in words is "twenty-one billion, two hundred eighty-nine million, three hundred seventy-five thousand, two hundred forty-two".