21375374 has 4 divisors (see below), whose sum is σ = 32063064. Its totient is φ = 10687686.

The previous prime is 21375373. The next prime is 21375379. The reversal of 21375374 is 47357312.

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

It is a super-2 number, since 2×21375374² = 913813227279752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21375374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375371) by changing a digit.

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 as a sum of consecutive naturals, namely, 5343842 + ... + 5343845.

It is an arithmetic number, because the mean of its divisors is an integer number (8015766).

Almost surely, 2^21375374 is an apocalyptic number.

21375374 is a deficient number, since it is larger than the sum of its proper divisors (10687690).

21375374 is a wasteful number, since it uses less digits than its factorization.

21375374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10687689.

The product of its digits is 17640, while the sum is 32.

The square root of 21375374 is about 4623.3509492575. The cubic root of 21375374 is about 277.5265737612.

The spelling of 21375374 in words is "twenty-one million, three hundred seventy-five thousand, three hundred seventy-four".