21949607716 has 9 divisors (see below), whose sum is σ = 38412332049. Its totient is φ = 10974655704.

The previous prime is 21949607683. The next prime is 21949607737. The reversal of 21949607716 is 61770694912.

The square root of 21949607716 is 148154.

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., 5022556900 + 16927050816 = 70870^2 + 130104^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 259270 + ... + 333346.

Almost surely, 2^21949607716 is an apocalyptic number.

21949607716 is the 148154-th square number.

It is an amenable number.

21949607716 is a deficient number, since it is larger than the sum of its proper divisors (16462724333).

21949607716 is an frugal number, since it uses more digits than its factorization.

21949607716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148158 (or 74079 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 21949607716 in words is "twenty-one billion, nine hundred forty-nine million, six hundred seven thousand, seven hundred sixteen".