21239792748 has 36 divisors (see below), whose sum is σ = 54831809760. Its totient is φ = 6929293536.

The previous prime is 21239792737. The next prime is 21239792831. The reversal of 21239792748 is 84729793212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21239792748² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21239792694 and 21239792703.

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 11 ways as a sum of consecutive naturals, for example, 6274843 + ... + 6278226.

Almost surely, 2^21239792748 is an apocalyptic number.

It is an amenable number.

21239792748 is an abundant number, since it is smaller than the sum of its proper divisors (33592017012).

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

21239792748 is a wasteful number, since it uses less digits than its factorization.

21239792748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12553126 (or 12553121 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 21239792748 in words is "twenty-one billion, two hundred thirty-nine million, seven hundred ninety-two thousand, seven hundred forty-eight".