21674412 has 24 divisors (see below), whose sum is σ = 56193200. Its totient is φ = 7224768.

The previous prime is 21674407. The next prime is 21674413. The reversal of 21674412 is 21447612.

21674412 is a `hidden beast` number, since 216 + 7 + 441 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21674413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100237 + ... + 100452.

Almost surely, 2^21674412 is an apocalyptic number.

It is an amenable number.

21674412 is an abundant number, since it is smaller than the sum of its proper divisors (34518788).

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

21674412 is a wasteful number, since it uses less digits than its factorization.

21674412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200702 (or 200694 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21674412 is about 4655.5785891766. The cubic root of 21674412 is about 278.8147689454.

The spelling of 21674412 in words is "twenty-one million, six hundred seventy-four thousand, four hundred twelve".