21235868344 has 32 divisors (see below), whose sum is σ = 40073616000. Its totient is φ = 10549672672.

The previous prime is 21235868321. The next prime is 21235868383. The reversal of 21235868344 is 44386853212.

It is a junction number, because it is equal to n+sod(n) for n = 21235868294 and 21235868303.

It is a congruent 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, 1883187 + ... + 1894429.

It is an arithmetic number, because the mean of its divisors is an integer number (1252300500).

Almost surely, 2^21235868344 is an apocalyptic number.

It is an amenable number.

21235868344 is a deficient number, since it is larger than the sum of its proper divisors (18837747656).

21235868344 is a wasteful number, since it uses less digits than its factorization.

21235868344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12747 (or 12743 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 46.

The spelling of 21235868344 in words is "twenty-one billion, two hundred thirty-five million, eight hundred sixty-eight thousand, three hundred forty-four".