21874403 has 4 divisors (see below), whose sum is σ = 22825488. Its totient is φ = 20923320.

The previous prime is 21874397. The next prime is 21874409. The reversal of 21874403 is 30447812.

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

It is an interprime number because it is at equal distance from previous prime (21874397) and next prime (21874409).

It is a cyclic number.

It is not a de Polignac number, because 21874403 - 2⁸ = 21874147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21874409) 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, 475508 + ... + 475553.

It is an arithmetic number, because the mean of its divisors is an integer number (5706372).

Almost surely, 2^21874403 is an apocalyptic number.

21874403 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21874403 is a deficient number, since it is larger than the sum of its proper divisors (951085).

21874403 is an equidigital number, since it uses as much as digits as its factorization.

21874403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951084.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21874403 is about 4677.0079110474. The cubic root of 21874403 is about 279.6696912789.

The spelling of 21874403 in words is "twenty-one million, eight hundred seventy-four thousand, four hundred three".