21674144 has 24 divisors (see below), whose sum is σ = 43581888. Its totient is φ = 10605760.

The previous prime is 21674141. The next prime is 21674153. The reversal of 21674144 is 44147612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21674141) 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, 5702 + ... + 8709.

It is an arithmetic number, because the mean of its divisors is an integer number (1815912).

Almost surely, 2^21674144 is an apocalyptic number.

It is an amenable number.

21674144 is an abundant number, since it is smaller than the sum of its proper divisors (21907744).

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

21674144 is a wasteful number, since it uses less digits than its factorization.

21674144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14468 (or 14460 counting only the distinct ones).

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

The square root of 21674144 is about 4655.5498064138. The cubic root of 21674144 is about 278.8136197767.

The spelling of 21674144 in words is "twenty-one million, six hundred seventy-four thousand, one hundred forty-four".