21667374 has 24 divisors (see below), whose sum is σ = 47094840. Its totient is φ = 7199568.

The previous prime is 21667351. The next prime is 21667381. The reversal of 21667374 is 47376612.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 4512 + ... + 7980.

It is an arithmetic number, because the mean of its divisors is an integer number (1962285).

Almost surely, 2^21667374 is an apocalyptic number.

21667374 is an abundant number, since it is smaller than the sum of its proper divisors (25427466).

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

21667374 is a wasteful number, since it uses less digits than its factorization.

21667374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3824 (or 3821 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 21667374 is about 4654.8226604243. The cubic root of 21667374 is about 278.7845872611.

The spelling of 21667374 in words is "twenty-one million, six hundred sixty-seven thousand, three hundred seventy-four".