21320466 has 8 divisors (see below), whose sum is σ = 42640944. Its totient is φ = 7106820.

The previous prime is 21320447. The next prime is 21320479. The reversal of 21320466 is 66402312.

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

21320466 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1776700 + ... + 1776711.

It is an arithmetic number, because the mean of its divisors is an integer number (5330118).

Almost surely, 2^21320466 is an apocalyptic number.

21320466 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21320466 is a wasteful number, since it uses less digits than its factorization.

21320466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553416.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21320466 is about 4617.4090137219. The cubic root of 21320466 is about 277.2887378342.

Adding to 21320466 its reverse (66402312), we get a palindrome (87722778).

The spelling of 21320466 in words is "twenty-one million, three hundred twenty thousand, four hundred sixty-six".