21947122994 has 8 divisors (see below), whose sum is σ = 32921500188. Its totient is φ = 10973289600.

The previous prime is 21947122937. The next prime is 21947123017. The reversal of 21947122994 is 49922174912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15578284969 + 6368838025 = 124813^2 + 79805^2 .

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, 12707 + ... + 209894.

Almost surely, 2^21947122994 is an apocalyptic number.

21947122994 is a deficient number, since it is larger than the sum of its proper divisors (10974377194).

21947122994 is a wasteful number, since it uses less digits than its factorization.

21947122994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271900.

The product of its digits is 653184, while the sum is 50.

The spelling of 21947122994 in words is "twenty-one billion, nine hundred forty-seven million, one hundred twenty-two thousand, nine hundred ninety-four".