21379703524 has 27 divisors (see below), whose sum is σ = 38764500411. Its totient is φ = 10317142080.

The previous prime is 21379703509. The next prime is 21379703531. The reversal of 21379703524 is 42530797312.

The square root of 21379703524 is 146218.

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

It can be written as a sum of positive squares in 4 ways, for example, as 9568361124 + 11811342400 = 97818^2 + 108680^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8479384 + ... + 8481904.

Almost surely, 2^21379703524 is an apocalyptic number.

21379703524 is the 146218-th square number.

It is an amenable number.

21379703524 is a deficient number, since it is larger than the sum of its proper divisors (17384796887).

21379703524 is an frugal number, since it uses more digits than its factorization.

21379703524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104 (or 2552 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 21379703524 in words is "twenty-one billion, three hundred seventy-nine million, seven hundred three thousand, five hundred twenty-four".