21929791950 has 108 divisors (see below), whose sum is σ = 64761313344. Its totient is φ = 5316300000.

The previous prime is 21929791931. The next prime is 21929791979. The reversal of 21929791950 is 5919792912.

21929791950 is a `hidden beast` number, since 219 + 297 + 91 + 9 + 50 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 146926 + ... + 255825.

Almost surely, 2^21929791950 is an apocalyptic number.

21929791950 is an abundant number, since it is smaller than the sum of its proper divisors (42831521394).

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

21929791950 is a wasteful number, since it uses less digits than its factorization.

21929791950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402791 (or 402772 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 54.

The spelling of 21929791950 in words is "twenty-one billion, nine hundred twenty-nine million, seven hundred ninety-one thousand, nine hundred fifty".