20131333231 has 16 divisors (see below), whose sum is σ = 20511792000. Its totient is φ = 19755040000.

The previous prime is 20131333217. The next prime is 20131333267. The reversal of 20131333231 is 13233313102.

It is a cyclic number.

It is not a de Polignac number, because 20131333231 - 2⁹ = 20131332719 is a prime.

It is a super-2 number, since 2×20131333231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131333531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8561706 + ... + 8564056.

It is an arithmetic number, because the mean of its divisors is an integer number (1281987000).

Almost surely, 2^20131333231 is an apocalyptic number.

20131333231 is a deficient number, since it is larger than the sum of its proper divisors (380458769).

20131333231 is a wasteful number, since it uses less digits than its factorization.

20131333231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 20131333231 its reverse (13233313102), we get a palindrome (33364646333).

The spelling of 20131333231 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-three thousand, two hundred thirty-one".