20130321231 has 64 divisors (see below), whose sum is σ = 32707584000. Its totient is φ = 12181363200.

The previous prime is 20130321217. The next prime is 20130321241. The reversal of 20130321231 is 13212303102.

It is not a de Polignac number, because 20130321231 - 2⁹ = 20130320719 is a prime.

It is a super-2 number, since 2×20130321231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130321241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4422945 + ... + 4427493.

It is an arithmetic number, because the mean of its divisors is an integer number (511056000).

Almost surely, 2^20130321231 is an apocalyptic number.

20130321231 is a deficient number, since it is larger than the sum of its proper divisors (12577262769).

20130321231 is a wasteful number, since it uses less digits than its factorization.

20130321231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4917 (or 4911 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20130321231 its reverse (13212303102), we get a palindrome (33342624333).

The spelling of 20130321231 in words is "twenty billion, one hundred thirty million, three hundred twenty-one thousand, two hundred thirty-one".