21463404 has 24 divisors (see below), whose sum is σ = 51435888. Its totient is φ = 6960960.

The previous prime is 21463373. The next prime is 21463417. The reversal of 21463404 is 40436412.

It is a super-2 number, since 2×21463404² = 921355422534432, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 23727 + ... + 24614.

It is an arithmetic number, because the mean of its divisors is an integer number (2143162).

Almost surely, 2^21463404 is an apocalyptic number.

It is an amenable number.

21463404 is an abundant number, since it is smaller than the sum of its proper divisors (29972484).

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

21463404 is a wasteful number, since it uses less digits than its factorization.

21463404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48385 (or 48383 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 21463404 is about 4632.8613188827. The cubic root of 21463404 is about 277.9070303135.

Adding to 21463404 its reverse (40436412), we get a palindrome (61899816).

The spelling of 21463404 in words is "twenty-one million, four hundred sixty-three thousand, four hundred four".