21871674 has 32 divisors (see below), whose sum is σ = 53023680. Its totient is φ = 6627600.

The previous prime is 21871667. The next prime is 21871721. The reversal of 21871674 is 47617812.

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, 17817 + ... + 19004.

It is an arithmetic number, because the mean of its divisors is an integer number (1656990).

Almost surely, 2^21871674 is an apocalyptic number.

21871674 is an abundant number, since it is smaller than the sum of its proper divisors (31152006).

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

21871674 is a wasteful number, since it uses less digits than its factorization.

21871674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36843 (or 36837 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 21871674 is about 4676.7161555946. The cubic root of 21871674 is about 279.6580604803.

The spelling of 21871674 in words is "twenty-one million, eight hundred seventy-one thousand, six hundred seventy-four".