21464004 has 12 divisors (see below), whose sum is σ = 50082704. Its totient is φ = 7154664.

The previous prime is 21463999. The next prime is 21464017. The reversal of 21464004 is 40046412.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 894322 + ... + 894345.

Almost surely, 2^21464004 is an apocalyptic number.

It is an amenable number.

21464004 is an abundant number, since it is smaller than the sum of its proper divisors (28618700).

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

21464004 is a wasteful number, since it uses less digits than its factorization.

21464004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788674 (or 1788672 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21464004 is about 4632.9260732285. The cubic root of 21464004 is about 277.9096198789.

The spelling of 21464004 in words is "twenty-one million, four hundred sixty-four thousand, four".