21772317146 has 8 divisors (see below), whose sum is σ = 34579562580. Its totient is φ = 10245796288.

The previous prime is 21772317139. The next prime is 21772317167. The reversal of 21772317146 is 64171327712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21582841921 + 189475225 = 146911^2 + 13765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320181101 + ... + 320181168.

Almost surely, 2^21772317146 is an apocalyptic number.

21772317146 is a deficient number, since it is larger than the sum of its proper divisors (12807245434).

21772317146 is a wasteful number, since it uses less digits than its factorization.

21772317146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640362288.

The product of its digits is 98784, while the sum is 41.

The spelling of 21772317146 in words is "twenty-one billion, seven hundred seventy-two million, three hundred seventeen thousand, one hundred forty-six".