20846269421 has 2 divisors, whose sum is σ = 20846269422. Its totient is φ = 20846269420.

The previous prime is 20846269399. The next prime is 20846269469. The reversal of 20846269421 is 12496264802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18554253796 + 2292015625 = 136214^2 + 47875^2 .

It is a cyclic number.

It is not a de Polignac number, because 20846269421 - 2²⁶ = 20779160557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20846269471) 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, 10423134710 + 10423134711.

It is an arithmetic number, because the mean of its divisors is an integer number (10423134711).

Almost surely, 2^20846269421 is an apocalyptic number.

It is an amenable number.

20846269421 is a deficient number, since it is larger than the sum of its proper divisors (1).

20846269421 is an equidigital number, since it uses as much as digits as its factorization.

20846269421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 20846269421 in words is "twenty billion, eight hundred forty-six million, two hundred sixty-nine thousand, four hundred twenty-one".