20122021243 has 2 divisors, whose sum is σ = 20122021244. Its totient is φ = 20122021242.

The previous prime is 20122021169. The next prime is 20122021357. The reversal of 20122021243 is 34212022102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20122021243 - 2²¹ = 20119924091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20122021243.

It is not a weakly prime, because it can be changed into another prime (20122021643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061010621 + 10061010622.

It is an arithmetic number, because the mean of its divisors is an integer number (10061010622).

Almost surely, 2^20122021243 is an apocalyptic number.

20122021243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122021243 is an equidigital number, since it uses as much as digits as its factorization.

20122021243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20122021243 its reverse (34212022102), we get a palindrome (54334043345).

The spelling of 20122021243 in words is "twenty billion, one hundred twenty-two million, twenty-one thousand, two hundred forty-three".