21814374 has 8 divisors (see below), whose sum is σ = 43628760. Its totient is φ = 7271456.

The previous prime is 21814369. The next prime is 21814379. The reversal of 21814374 is 47341812.

It is an interprime number because it is at equal distance from previous prime (21814369) and next prime (21814379).

It is a sphenic number, since it is the product of 3 distinct primes.

21814374 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814379) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1817859 + ... + 1817870.

It is an arithmetic number, because the mean of its divisors is an integer number (5453595).

Almost surely, 2^21814374 is an apocalyptic number.

21814374 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21814374 is a wasteful number, since it uses less digits than its factorization.

21814374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635734.

The product of its digits is 5376, while the sum is 30.

The square root of 21814374 is about 4670.5860445987. The cubic root of 21814374 is about 279.4136283289.

It can be divided in two parts, 2181 and 4374, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 21814374 in words is "twenty-one million, eight hundred fourteen thousand, three hundred seventy-four".