21968797834 has 4 divisors (see below), whose sum is σ = 32953196754. Its totient is φ = 10984398916.

The previous prime is 21968797819. The next prime is 21968797843. The reversal of 21968797834 is 43879786912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13403850625 + 8564947209 = 115775^2 + 92547^2 .

It is a super-3 number, since 3×21968797834³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5492199457 + ... + 5492199460.

Almost surely, 2^21968797834 is an apocalyptic number.

21968797834 is a deficient number, since it is larger than the sum of its proper divisors (10984398920).

21968797834 is a wasteful number, since it uses less digits than its factorization.

21968797834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10984398919.

The product of its digits is 36578304, while the sum is 64.

The spelling of 21968797834 in words is "twenty-one billion, nine hundred sixty-eight million, seven hundred ninety-seven thousand, eight hundred thirty-four".