21890274 has 32 divisors (see below), whose sum is σ = 50512896. Its totient is φ = 6194640.

The previous prime is 21890257. The next prime is 21890317. The reversal of 21890274 is 47209812.

It is a happy number.

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, 2059 + ... + 6929.

It is an arithmetic number, because the mean of its divisors is an integer number (1578528).

Almost surely, 2^21890274 is an apocalyptic number.

21890274 is an abundant number, since it is smaller than the sum of its proper divisors (28622622).

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

21890274 is a wasteful number, since it uses less digits than its factorization.

21890274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4990.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 21890274 is about 4678.7043078186. The cubic root of 21890274 is about 279.7373131567.

The spelling of 21890274 in words is "twenty-one million, eight hundred ninety thousand, two hundred seventy-four".