21866474 has 8 divisors (see below), whose sum is σ = 37485408. Its totient is φ = 9371340.

The previous prime is 21866459. The next prime is 21866477. The reversal of 21866474 is 47466812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21866477) 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, 780932 + ... + 780959.

It is an arithmetic number, because the mean of its divisors is an integer number (4685676).

Almost surely, 2^21866474 is an apocalyptic number.

21866474 is a deficient number, since it is larger than the sum of its proper divisors (15618934).

21866474 is a wasteful number, since it uses less digits than its factorization.

21866474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561900.

The product of its digits is 64512, while the sum is 38.

The square root of 21866474 is about 4676.1601768973. The cubic root of 21866474 is about 279.6358957818.

The spelling of 21866474 in words is "twenty-one million, eight hundred sixty-six thousand, four hundred seventy-four".