20131312033 has 4 divisors (see below), whose sum is σ = 23007213760. Its totient is φ = 17255410308.

The previous prime is 20131311983. The next prime is 20131312043. The reversal of 20131312033 is 33021313102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131312033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20131312033.

It is not an unprimeable number, because it can be changed into a prime (20131312043) 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, 1437950853 + ... + 1437950866.

It is an arithmetic number, because the mean of its divisors is an integer number (5751803440).

Almost surely, 2^20131312033 is an apocalyptic number.

It is an amenable number.

20131312033 is a deficient number, since it is larger than the sum of its proper divisors (2875901727).

20131312033 is an equidigital number, since it uses as much as digits as its factorization.

20131312033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875901726.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 20131312033 its reverse (33021313102), we get a palindrome (53152625135).

The spelling of 20131312033 in words is "twenty billion, one hundred thirty-one million, three hundred twelve thousand, thirty-three".