21947237316 has 27 divisors (see below), whose sum is σ = 55479985743. Its totient is φ = 7315449480.

The previous prime is 21947237287. The next prime is 21947237329. The reversal of 21947237316 is 61373274912.

The square root of 21947237316 is 148146.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 876531 + ... + 901221.

Almost surely, 2^21947237316 is an apocalyptic number.

21947237316 is the 148146-th square number.

It is an amenable number.

21947237316 is an abundant number, since it is smaller than the sum of its proper divisors (33532748427).

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

21947237316 is an frugal number, since it uses more digits than its factorization.

21947237316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49392 (or 24696 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The spelling of 21947237316 in words is "twenty-one billion, nine hundred forty-seven million, two hundred thirty-seven thousand, three hundred sixteen".