21207514384 has 75 divisors (see below), whose sum is σ = 47999568983. Its totient is φ = 9076701984.

The previous prime is 21207514379. The next prime is 21207514421. The reversal of 21207514384 is 48341570212.

The square root of 21207514384 is 145628.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 28542717 + ... + 28543459.

Almost surely, 2^21207514384 is an apocalyptic number.

21207514384 is the 145628-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21207514384

21207514384 is an abundant number, since it is smaller than the sum of its proper divisors (26792054599).

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

21207514384 is an frugal number, since it uses more digits than its factorization.

21207514384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 21207514384 in words is "twenty-one billion, two hundred seven million, five hundred fourteen thousand, three hundred eighty-four".