21402466 has 8 divisors (see below), whose sum is σ = 33499584. Its totient is φ = 10235940.

The previous prime is 21402419. The next prime is 21402467. The reversal of 21402466 is 66420412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21402466.

It is not an unprimeable number, because it can be changed into a prime (21402467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232590 + ... + 232681.

It is an arithmetic number, because the mean of its divisors is an integer number (4187448).

Almost surely, 2^21402466 is an apocalyptic number.

21402466 is a deficient number, since it is larger than the sum of its proper divisors (12097118).

21402466 is a wasteful number, since it uses less digits than its factorization.

21402466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465296.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 21402466 is about 4626.2799310029. The cubic root of 21402466 is about 277.6437736700.

Adding to 21402466 its reverse (66420412), we get a palindrome (87822878).

The spelling of 21402466 in words is "twenty-one million, four hundred two thousand, four hundred sixty-six".