20244019921 has 2 divisors, whose sum is σ = 20244019922. Its totient is φ = 20244019920.

The previous prime is 20244019891. The next prime is 20244020033. The reversal of 20244019921 is 12991044202.

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., 16184928400 + 4059091521 = 127220^2 + 63711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20244019921 - 2³³ = 11654085329 is a prime.

It is not a weakly prime, because it can be changed into another prime (20244019421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122009960 + 10122009961.

It is an arithmetic number, because the mean of its divisors is an integer number (10122009961).

Almost surely, 2^20244019921 is an apocalyptic number.

It is an amenable number.

20244019921 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244019921 is an equidigital number, since it uses as much as digits as its factorization.

20244019921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 20244019921 in words is "twenty billion, two hundred forty-four million, nineteen thousand, nine hundred twenty-one".