21958796 has 6 divisors (see below), whose sum is σ = 38427900. Its totient is φ = 10979396.

The previous prime is 21958759. The next prime is 21958799. The reversal of 21958796 is 69785912.

It is a self number, because there is not a number n which added to its sum of digits gives 21958796.

It is not an unprimeable number, because it can be changed into a prime (21958799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2744846 + ... + 2744853.

It is an arithmetic number, because the mean of its divisors is an integer number (6404650).

Almost surely, 2^21958796 is an apocalyptic number.

It is an amenable number.

21958796 is a deficient number, since it is larger than the sum of its proper divisors (16469104).

21958796 is a wasteful number, since it uses less digits than its factorization.

21958796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489703 (or 5489701 counting only the distinct ones).

The product of its digits is 272160, while the sum is 47.

The square root of 21958796 is about 4686.0213401136. The cubic root of 21958796 is about 280.0288915766.

The spelling of 21958796 in words is "twenty-one million, nine hundred fifty-eight thousand, seven hundred ninety-six".