21956794 has 16 divisors (see below), whose sum is σ = 33739560. Its totient is φ = 10713600.

The previous prime is 21956777. The next prime is 21956801. The reversal of 21956794 is 49765912.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20930625 + 1026169 = 4575^2 + 1013^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21956794.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14002 + ... + 15490.

Almost surely, 2^21956794 is an apocalyptic number.

21956794 is a deficient number, since it is larger than the sum of its proper divisors (11782766).

21956794 is a wasteful number, since it uses less digits than its factorization.

21956794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665.

The product of its digits is 136080, while the sum is 43.

The square root of 21956794 is about 4685.8077211939. The cubic root of 21956794 is about 280.0203811695.

The spelling of 21956794 in words is "twenty-one million, nine hundred fifty-six thousand, seven hundred ninety-four".