21703572747 has 6 divisors (see below), whose sum is σ = 31349605092. Its totient is φ = 14469048492.

The previous prime is 21703572727. The next prime is 21703572749. The reversal of 21703572747 is 74727530712.

21703572747 is a `hidden beast` number, since 2 + 1 + 7 + 0 + 3 + 572 + 74 + 7 = 666.

It is not a de Polignac number, because 21703572747 - 2¹⁰ = 21703571723 is a prime.

It is a super-2 number, since 2×21703572747² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21703572749) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1205754033 + ... + 1205754050.

It is an arithmetic number, because the mean of its divisors is an integer number (5224934182).

Almost surely, 2^21703572747 is an apocalyptic number.

21703572747 is a deficient number, since it is larger than the sum of its proper divisors (9646032345).

21703572747 is a wasteful number, since it uses less digits than its factorization.

21703572747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411508089 (or 2411508086 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 45.

The spelling of 21703572747 in words is "twenty-one billion, seven hundred three million, five hundred seventy-two thousand, seven hundred forty-seven".