21939074 has 8 divisors (see below), whose sum is σ = 32933628. Its totient is φ = 10961200.

The previous prime is 21939067. The next prime is 21939097. The reversal of 21939074 is 47093912.

It can be written as a sum of positive squares in 2 ways, for example, as 19298449 + 2640625 = 4393^2 + 1625^2 .

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77 + ... + 6624.

Almost surely, 2^21939074 is an apocalyptic number.

21939074 is a deficient number, since it is larger than the sum of its proper divisors (10994554).

21939074 is a wasteful number, since it uses less digits than its factorization.

21939074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 21939074 is about 4683.9165235943. The cubic root of 21939074 is about 279.9450317266.

It can be divided in two parts, 219 and 39074, that added together give a palindrome (39293).

The spelling of 21939074 in words is "twenty-one million, nine hundred thirty-nine thousand, seventy-four".