21959374 has 4 divisors (see below), whose sum is σ = 32939064. Its totient is φ = 10979686.

The previous prime is 21959341. The next prime is 21959407. The reversal of 21959374 is 47395912.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21959341) and next prime (21959407).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5489842 + ... + 5489845.

It is an arithmetic number, because the mean of its divisors is an integer number (8234766).

Almost surely, 2^21959374 is an apocalyptic number.

21959374 is a deficient number, since it is larger than the sum of its proper divisors (10979690).

21959374 is a wasteful number, since it uses less digits than its factorization.

21959374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10979689.

The product of its digits is 68040, while the sum is 40.

The square root of 21959374 is about 4686.0830124956. The cubic root of 21959374 is about 280.0313485309.

The spelling of 21959374 in words is "twenty-one million, nine hundred fifty-nine thousand, three hundred seventy-four".