21755070392 has 16 divisors (see below), whose sum is σ = 44499007800. Its totient is φ = 9888668320.

The previous prime is 21755070347. The next prime is 21755070419. The reversal of 21755070392 is 29307055712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123608267 + ... + 123608442.

Almost surely, 2^21755070392 is an apocalyptic number.

21755070392 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21755070392 is an abundant number, since it is smaller than the sum of its proper divisors (22743937408).

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

21755070392 is a wasteful number, since it uses less digits than its factorization.

21755070392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247216726 (or 247216722 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 41.

The spelling of 21755070392 in words is "twenty-one billion, seven hundred fifty-five million, seventy thousand, three hundred ninety-two".