21906976 has 48 divisors (see below), whose sum is σ = 53089344. Its totient is φ = 8665344.

The previous prime is 21906961. The next prime is 21907007. The reversal of 21906976 is 67960912.

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, 850 + ... + 6673.

It is an arithmetic number, because the mean of its divisors is an integer number (1106028).

Almost surely, 2^21906976 is an apocalyptic number.

21906976 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21906976 is an abundant number, since it is smaller than the sum of its proper divisors (31182368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21906976 is a wasteful number, since it uses less digits than its factorization.

21906976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7553 (or 7545 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 21906976 is about 4680.4888633560. The cubic root of 21906976 is about 279.8084404046.

The spelling of 21906976 in words is "twenty-one million, nine hundred six thousand, nine hundred seventy-six".