21749760484 has 27 divisors (see below), whose sum is σ = 40181136681. Its totient is φ = 10299863520.

The previous prime is 21749760479. The next prime is 21749760493. The reversal of 21749760484 is 48406794712.

The square root of 21749760484 is 147478.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13707258084 + 8042502400 = 117078^2 + 89680^2 .

It is a super-2 number, since 2×21749760484² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5602224 + ... + 5606104.

Almost surely, 2^21749760484 is an apocalyptic number.

21749760484 is the 147478-th square number.

It is an amenable number.

21749760484 is a deficient number, since it is larger than the sum of its proper divisors (18431376197).

21749760484 is an frugal number, since it uses more digits than its factorization.

21749760484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7804 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 21749760484 in words is "twenty-one billion, seven hundred forty-nine million, seven hundred sixty thousand, four hundred eighty-four".