21874441 has 4 divisors (see below), whose sum is σ = 21907152. Its totient is φ = 21841732.

The previous prime is 21874421. The next prime is 21874451. The reversal of 21874441 is 14447812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21874441 - 2⁵ = 21874409 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21874421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15331 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (5476788).

Almost surely, 2^21874441 is an apocalyptic number.

It is an amenable number.

21874441 is a deficient number, since it is larger than the sum of its proper divisors (32711).

21874441 is an equidigital number, since it uses as much as digits as its factorization.

21874441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32710.

The product of its digits is 7168, while the sum is 31.

The square root of 21874441 is about 4677.0119734720. The cubic root of 21874441 is about 279.6698532253.

The spelling of 21874441 in words is "twenty-one million, eight hundred seventy-four thousand, four hundred forty-one".