21939505353 has 24 divisors (see below), whose sum is σ = 31802928768. Its totient is φ = 14574494592.

The previous prime is 21939505339. The next prime is 21939505369. The reversal of 21939505353 is 35350593912.

21939505353 is a `hidden beast` number, since 2 + 1 + 93 + 9 + 505 + 3 + 53 = 666.

It is not a de Polignac number, because 21939505353 - 2⁸ = 21939505097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21939505299 and 21939505308.

It is not an unprimeable number, because it can be changed into a prime (21939505373) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3253201 + ... + 3259937.

It is an arithmetic number, because the mean of its divisors is an integer number (1325122032).

Almost surely, 2^21939505353 is an apocalyptic number.

It is an amenable number.

21939505353 is a deficient number, since it is larger than the sum of its proper divisors (9863423415).

21939505353 is a wasteful number, since it uses less digits than its factorization.

21939505353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7973 (or 7970 counting only the distinct ones).

The product of its (nonzero) digits is 546750, while the sum is 45.

The spelling of 21939505353 in words is "twenty-one billion, nine hundred thirty-nine million, five hundred five thousand, three hundred fifty-three".