20846992121 has 2 divisors, whose sum is σ = 20846992122. Its totient is φ = 20846992120.

The previous prime is 20846992099. The next prime is 20846992193. The reversal of 20846992121 is 12129964802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14312533225 + 6534458896 = 119635^2 + 80836^2 .

It is a cyclic number.

It is not a de Polignac number, because 20846992121 - 2²² = 20842797817 is a prime.

It is not a weakly prime, because it can be changed into another prime (20846992321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10423496060 + 10423496061.

It is an arithmetic number, because the mean of its divisors is an integer number (10423496061).

Almost surely, 2^20846992121 is an apocalyptic number.

It is an amenable number.

20846992121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20846992121 is an equidigital number, since it uses as much as digits as its factorization.

20846992121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The spelling of 20846992121 in words is "twenty billion, eight hundred forty-six million, nine hundred ninety-two thousand, one hundred twenty-one".