21477466 has 8 divisors (see below), whose sum is σ = 32289300. Its totient is φ = 10714368.

The previous prime is 21477461. The next prime is 21477497. The reversal of 21477466 is 66477412.

It can be written as a sum of positive squares in 2 ways, for example, as 21206025 + 271441 = 4605^2 + 521^2 .

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

It is a super-2 number, since 2×21477466² = 922563091562312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477461) 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 3 ways as a sum of consecutive naturals, for example, 11061 + ... + 12856.

Almost surely, 2^21477466 is an apocalyptic number.

21477466 is a deficient number, since it is larger than the sum of its proper divisors (10811834).

21477466 is a wasteful number, since it uses less digits than its factorization.

21477466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24368.

The product of its digits is 56448, while the sum is 37.

The square root of 21477466 is about 4634.3787070113. The cubic root of 21477466 is about 277.9677084105.

It can be divided in two parts, 214774 and 66, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 21477466 in words is "twenty-one million, four hundred seventy-seven thousand, four hundred sixty-six".