21854374 has 4 divisors (see below), whose sum is σ = 32781564. Its totient is φ = 10927186.

The previous prime is 21854369. The next prime is 21854419. The reversal of 21854374 is 47345812.

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

It is a super-2 number, since 2×21854374² = 955227325863752, which contains 22 as substring.

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, 5463592 + ... + 5463595.

It is an arithmetic number, because the mean of its divisors is an integer number (8195391).

Almost surely, 2^21854374 is an apocalyptic number.

21854374 is a deficient number, since it is larger than the sum of its proper divisors (10927190).

21854374 is a wasteful number, since it uses less digits than its factorization.

21854374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10927189.

The product of its digits is 26880, while the sum is 34.

The square root of 21854374 is about 4674.8662012939. The cubic root of 21854374 is about 279.5843066284.

The spelling of 21854374 in words is "twenty-one million, eight hundred fifty-four thousand, three hundred seventy-four".