20331012109 has 2 divisors, whose sum is σ = 20331012110. Its totient is φ = 20331012108.

The previous prime is 20331012103. The next prime is 20331012133. The reversal of 20331012109 is 90121013302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19447139209 + 883872900 = 139453^2 + 29730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331012109 - 2¹¹ = 20331010061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20331012109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331012103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165506054 + 10165506055.

It is an arithmetic number, because the mean of its divisors is an integer number (10165506055).

Almost surely, 2^20331012109 is an apocalyptic number.

It is an amenable number.

20331012109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331012109 is an equidigital number, since it uses as much as digits as its factorization.

20331012109 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 22.

The spelling of 20331012109 in words is "twenty billion, three hundred thirty-one million, twelve thousand, one hundred nine".