21604314006 has 48 divisors (see below), whose sum is σ = 52956042048. Its totient is φ = 6546760200.

The previous prime is 21604313981. The next prime is 21604314007. The reversal of 21604314006 is 60041340612.

21604314006 is a `hidden beast` number, since 21 + 604 + 31 + 4 + 0 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21604314007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2015260 + ... + 2025951.

It is an arithmetic number, because the mean of its divisors is an integer number (1103250876).

Almost surely, 2^21604314006 is an apocalyptic number.

21604314006 is an abundant number, since it is smaller than the sum of its proper divisors (31351728042).

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

21604314006 is a wasteful number, since it uses less digits than its factorization.

21604314006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041239 (or 4041227 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21604314006 its reverse (60041340612), we get a palindrome (81645654618).

The spelling of 21604314006 in words is "twenty-one billion, six hundred four million, three hundred fourteen thousand, six".