20331123311 has 2 divisors, whose sum is σ = 20331123312. Its totient is φ = 20331123310.

The previous prime is 20331123287. The next prime is 20331123317. The reversal of 20331123311 is 11332113302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331123311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331123317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165561655 + 10165561656.

It is an arithmetic number, because the mean of its divisors is an integer number (10165561656).

Almost surely, 2^20331123311 is an apocalyptic number.

20331123311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331123311 is an equidigital number, since it uses as much as digits as its factorization.

20331123311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20331123311 its reverse (11332113302), we get a palindrome (31663236613).

It can be divided in two parts, 203311 and 23311, that added together give a palindrome (226622).

The spelling of 20331123311 in words is "twenty billion, three hundred thirty-one million, one hundred twenty-three thousand, three hundred eleven".