21413004 has 24 divisors (see below), whose sum is σ = 50568000. Its totient is φ = 7051344.

The previous prime is 21413003. The next prime is 21413009. The reversal of 21413004 is 40031412.

It is not an unprimeable number, because it can be changed into a prime (21413003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9754 + ... + 11745.

It is an arithmetic number, because the mean of its divisors is an integer number (2107000).

Almost surely, 2^21413004 is an apocalyptic number.

It is an amenable number.

21413004 is an abundant number, since it is smaller than the sum of its proper divisors (29154996).

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

21413004 is a wasteful number, since it uses less digits than its factorization.

21413004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21589 (or 21587 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21413004 is about 4627.4187188972. The cubic root of 21413004 is about 277.6893343081.

Adding to 21413004 its reverse (40031412), we get a palindrome (61444416).

The spelling of 21413004 in words is "twenty-one million, four hundred thirteen thousand, four".