21462404 has 24 divisors (see below), whose sum is σ = 39701760. Its totient is φ = 10131264.

The previous prime is 21462401. The next prime is 21462433. The reversal of 21462404 is 40426412.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 21462404.

It is not an unprimeable number, because it can be changed into a prime (21462401) 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 7 ways as a sum of consecutive naturals, for example, 5792 + ... + 8744.

It is an arithmetic number, because the mean of its divisors is an integer number (1654240).

Almost surely, 2^21462404 is an apocalyptic number.

It is an amenable number.

21462404 is a deficient number, since it is larger than the sum of its proper divisors (18239356).

21462404 is a wasteful number, since it uses less digits than its factorization.

21462404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059 (or 3057 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 21462404 is about 4632.7533929619. The cubic root of 21462404 is about 277.9027142639.

Adding to 21462404 its reverse (40426412), we get a palindrome (61888816).

The spelling of 21462404 in words is "twenty-one million, four hundred sixty-two thousand, four hundred four".