21740738572 has 12 divisors (see below), whose sum is σ = 43481477200. Its totient is φ = 9317459376.

The previous prime is 21740738533. The next prime is 21740738671. The reversal of 21740738572 is 27583704712.

21740738572 is an admirable 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, 388227447 + ... + 388227502.

Almost surely, 2^21740738572 is an apocalyptic number.

It is an amenable number.

21740738572 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21740738572 is a wasteful number, since it uses less digits than its factorization.

21740738572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776454960 (or 776454958 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 46.

The spelling of 21740738572 in words is "twenty-one billion, seven hundred forty million, seven hundred thirty-eight thousand, five hundred seventy-two".