21366474 has 16 divisors (see below), whose sum is σ = 42863808. Its totient is φ = 7100352.

The previous prime is 21366463. The next prime is 21366487. The reversal of 21366474 is 47466312.

It is a happy number.

It is a super-2 number, since 2×21366474² = 913052422385352, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3262 + ... + 7305.

It is an arithmetic number, because the mean of its divisors is an integer number (2678988).

Almost surely, 2^21366474 is an apocalyptic number.

21366474 is an abundant number, since it is smaller than the sum of its proper divisors (21497334).

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

21366474 is a wasteful number, since it uses less digits than its factorization.

21366474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909.

The product of its digits is 24192, while the sum is 33.

The square root of 21366474 is about 4622.3883437029. The cubic root of 21366474 is about 277.4880507800.

The spelling of 21366474 in words is "twenty-one million, three hundred sixty-six thousand, four hundred seventy-four".