21513413204 has 12 divisors (see below), whose sum is σ = 37658107200. Its totient is φ = 10753954008.

The previous prime is 21513413197. The next prime is 21513413209. The reversal of 21513413204 is 40231431512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513413209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670514 + ... + 701865.

It is an arithmetic number, because the mean of its divisors is an integer number (3138175600).

Almost surely, 2^21513413204 is an apocalyptic number.

It is an amenable number.

21513413204 is a deficient number, since it is larger than the sum of its proper divisors (16144693996).

21513413204 is a wasteful number, since it uses less digits than its factorization.

21513413204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376302 (or 1376300 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21513413204 its reverse (40231431512), we get a palindrome (61744844716).

The spelling of 21513413204 in words is "twenty-one billion, five hundred thirteen million, four hundred thirteen thousand, two hundred four".