20221709939 has 2 divisors, whose sum is σ = 20221709940. Its totient is φ = 20221709938.

The previous prime is 20221709929. The next prime is 20221709969. The reversal of 20221709939 is 93990712202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221709939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20221709939.

It is not a weakly prime, because it can be changed into another prime (20221709929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110854969 + 10110854970.

It is an arithmetic number, because the mean of its divisors is an integer number (10110854970).

Almost surely, 2^20221709939 is an apocalyptic number.

20221709939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221709939 is an equidigital number, since it uses as much as digits as its factorization.

20221709939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 20221709939 in words is "twenty billion, two hundred twenty-one million, seven hundred nine thousand, nine hundred thirty-nine".