20331012811 has 2 divisors, whose sum is σ = 20331012812. Its totient is φ = 20331012810.

The previous prime is 20331012787. The next prime is 20331012839. The reversal of 20331012811 is 11821013302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331012811 - 2⁷ = 20331012683 is a prime.

It is a super-2 number, since 2×20331012811² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20331012841) 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, 10165506405 + 10165506406.

It is an arithmetic number, because the mean of its divisors is an integer number (10165506406).

Almost surely, 2^20331012811 is an apocalyptic number.

20331012811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331012811 is an equidigital number, since it uses as much as digits as its factorization.

20331012811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20331012811 in words is "twenty billion, three hundred thirty-one million, twelve thousand, eight hundred eleven".