21630132006 has 64 divisors (see below), whose sum is σ = 51616051200. Its totient is φ = 5908342176.

The previous prime is 21630131993. The next prime is 21630132059. The reversal of 21630132006 is 60023103612.

It is a happy number.

It is a super-2 number, since 2×21630132006² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2448265 + ... + 2457083.

It is an arithmetic number, because the mean of its divisors is an integer number (806500800).

Almost surely, 2^21630132006 is an apocalyptic number.

21630132006 is an abundant number, since it is smaller than the sum of its proper divisors (29985919194).

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

21630132006 is a wasteful number, since it uses less digits than its factorization.

21630132006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11393.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21630132006 its reverse (60023103612), we get a palindrome (81653235618).

The spelling of 21630132006 in words is "twenty-one billion, six hundred thirty million, one hundred thirty-two thousand, six".