21951651792 has 80 divisors (see below), whose sum is σ = 65135513600. Its totient is φ = 6240364416.

The previous prime is 21951651773. The next prime is 21951651803. The reversal of 21951651792 is 29715615912.

It is a super-2 number, since 2×21951651792² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 97288 + ... + 231015.

It is an arithmetic number, because the mean of its divisors is an integer number (814193920).

Almost surely, 2^21951651792 is an apocalyptic number.

It is an amenable number.

21951651792 is an abundant number, since it is smaller than the sum of its proper divisors (43183861808).

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

21951651792 is a wasteful number, since it uses less digits than its factorization.

21951651792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328520 (or 328514 counting only the distinct ones).

The product of its digits is 340200, while the sum is 48.

The spelling of 21951651792 in words is "twenty-one billion, nine hundred fifty-one million, six hundred fifty-one thousand, seven hundred ninety-two".