21874546 has 8 divisors (see below), whose sum is σ = 34741980. Its totient is φ = 10293888.

The previous prime is 21874537. The next prime is 21874549. The reversal of 21874546 is 64547812.

It can be written as a sum of positive squares in 2 ways, for example, as 19900521 + 1974025 = 4461^2 + 1405^2 .

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

It is a super-2 number, since 2×21874546² = 956991525412232, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21874549) 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, 321651 + ... + 321718.

Almost surely, 2^21874546 is an apocalyptic number.

21874546 is a deficient number, since it is larger than the sum of its proper divisors (12867434).

21874546 is a wasteful number, since it uses less digits than its factorization.

21874546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643388.

The product of its digits is 53760, while the sum is 37.

The square root of 21874546 is about 4677.0231985741. The cubic root of 21874546 is about 279.6703007078.

It can be divided in two parts, 218745 and 46, that added together give a triangular number (218791 = T₆₆₁).

The spelling of 21874546 in words is "twenty-one million, eight hundred seventy-four thousand, five hundred forty-six".