21974806 has 32 divisors (see below), whose sum is σ = 38953728. Its totient is φ = 9102240.

The previous prime is 21974789. The next prime is 21974809. The reversal of 21974806 is 60847912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104041 + ... + 104251.

It is an arithmetic number, because the mean of its divisors is an integer number (1217304).

Almost surely, 2^21974806 is an apocalyptic number.

21974806 is a deficient number, since it is larger than the sum of its proper divisors (16978922).

21974806 is a wasteful number, since it uses less digits than its factorization.

21974806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21974806 is about 4687.7293010582. The cubic root of 21974806 is about 280.0969307263.

The spelling of 21974806 in words is "twenty-one million, nine hundred seventy-four thousand, eight hundred six".