20121232331 has 2 divisors, whose sum is σ = 20121232332. Its totient is φ = 20121232330.

The previous prime is 20121232291. The next prime is 20121232349. The reversal of 20121232331 is 13323212102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20121232331 - 2⁶ = 20121232267 is a prime.

It is a super-2 number, since 2×20121232331² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20121232361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060616165 + 10060616166.

It is an arithmetic number, because the mean of its divisors is an integer number (10060616166).

Almost surely, 2^20121232331 is an apocalyptic number.

20121232331 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121232331 is an equidigital number, since it uses as much as digits as its factorization.

20121232331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20121232331 its reverse (13323212102), we get a palindrome (33444444433).

The spelling of 20121232331 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-two thousand, three hundred thirty-one".