21924722 has 16 divisors (see below), whose sum is σ = 33656472. Its totient is φ = 10707840.

The previous prime is 21924697. The next prime is 21924731. The reversal of 21924722 is 22742912.

It can be written as a sum of positive squares in 4 ways, for example, as 19989841 + 1934881 = 4471^2 + 1391^2 .

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 7 ways as a sum of consecutive naturals, for example, 41822 + ... + 42342.

Almost surely, 2^21924722 is an apocalyptic number.

21924722 is a deficient number, since it is larger than the sum of its proper divisors (11731750).

21924722 is a wasteful number, since it uses less digits than its factorization.

21924722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973.

The product of its digits is 4032, while the sum is 29.

The square root of 21924722 is about 4682.3842217400. The cubic root of 21924722 is about 279.8839740368.

It can be divided in two parts, 2 and 1924722, that multiplied together give a square (3849444 = 1962²).

The spelling of 21924722 in words is "twenty-one million, nine hundred twenty-four thousand, seven hundred twenty-two".