21939922 has 8 divisors (see below), whose sum is σ = 33217776. Its totient is φ = 10867332.

The previous prime is 21939919. The next prime is 21939937. The reversal of 21939922 is 22993912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51048 + ... + 51475.

It is an arithmetic number, because the mean of its divisors is an integer number (4152222).

Almost surely, 2^21939922 is an apocalyptic number.

21939922 is a deficient number, since it is larger than the sum of its proper divisors (11277854).

21939922 is a wasteful number, since it uses less digits than its factorization.

21939922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102632.

The product of its digits is 17496, while the sum is 37.

The square root of 21939922 is about 4684.0070452552. The cubic root of 21939922 is about 279.9486385383.

The spelling of 21939922 in words is "twenty-one million, nine hundred thirty-nine thousand, nine hundred twenty-two".