21874105 has 16 divisors (see below), whose sum is σ = 28854144. Its totient is φ = 15786880.

The previous prime is 21874079. The next prime is 21874123. The reversal of 21874105 is 50147812.

It is not a de Polignac number, because 21874105 - 2⁷ = 21873977 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6084 + ... + 8986.

It is an arithmetic number, because the mean of its divisors is an integer number (1803384).

Almost surely, 2^21874105 is an apocalyptic number.

It is an amenable number.

21874105 is a deficient number, since it is larger than the sum of its proper divisors (6980039).

21874105 is a wasteful number, since it uses less digits than its factorization.

21874105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 21874105 is about 4676.9760529641. The cubic root of 21874105 is about 279.6684212717.

The spelling of 21874105 in words is "twenty-one million, eight hundred seventy-four thousand, one hundred five".