21249875692 has 24 divisors (see below), whose sum is σ = 37597479920. Its totient is φ = 10508097600.

The previous prime is 21249875659. The next prime is 21249875701. The reversal of 21249875692 is 29657894212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193942 + ... + 283042.

Almost surely, 2^21249875692 is an apocalyptic number.

It is an amenable number.

21249875692 is a deficient number, since it is larger than the sum of its proper divisors (16347604228).

21249875692 is a wasteful number, since it uses less digits than its factorization.

21249875692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89761 (or 89759 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 55.

The spelling of 21249875692 in words is "twenty-one billion, two hundred forty-nine million, eight hundred seventy-five thousand, six hundred ninety-two".