20115332231 has 2 divisors, whose sum is σ = 20115332232. Its totient is φ = 20115332230.

The previous prime is 20115332227. The next prime is 20115332267. The reversal of 20115332231 is 13223351102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20115332231 - 2² = 20115332227 is a prime.

It is a super-2 number, since 2×20115332231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20115332197 and 20115332206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20115332131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057666115 + 10057666116.

It is an arithmetic number, because the mean of its divisors is an integer number (10057666116).

Almost surely, 2^20115332231 is an apocalyptic number.

20115332231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115332231 is an equidigital number, since it uses as much as digits as its factorization.

20115332231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 20115332231 its reverse (13223351102), we get a palindrome (33338683333).

The spelling of 20115332231 in words is "twenty billion, one hundred fifteen million, three hundred thirty-two thousand, two hundred thirty-one".