21874233 has 4 divisors (see below), whose sum is σ = 29165648. Its totient is φ = 14582820.

The previous prime is 21874199. The next prime is 21874241. The reversal of 21874233 is 33247812.

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 not a de Polignac number, because 21874233 - 2⁶ = 21874169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21874233.

It is not an unprimeable number, because it can be changed into a prime (21873233) 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, 3645703 + ... + 3645708.

It is an arithmetic number, because the mean of its divisors is an integer number (7291412).

Almost surely, 2^21874233 is an apocalyptic number.

It is an amenable number.

21874233 is a deficient number, since it is larger than the sum of its proper divisors (7291415).

21874233 is an equidigital number, since it uses as much as digits as its factorization.

21874233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7291414.

The product of its digits is 8064, while the sum is 30.

The square root of 21874233 is about 4676.9897369996. The cubic root of 21874233 is about 279.6689667796.

The spelling of 21874233 in words is "twenty-one million, eight hundred seventy-four thousand, two hundred thirty-three".