20202221989 has 2 divisors, whose sum is σ = 20202221990. Its totient is φ = 20202221988.

The previous prime is 20202221939. The next prime is 20202222023. The reversal of 20202221989 is 98912220202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19716372225 + 485849764 = 140415^2 + 22042^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202221989 - 2⁹ = 20202221477 is a prime.

It is a super-2 number, since 2×20202221989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202221929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101110994 + 10101110995.

It is an arithmetic number, because the mean of its divisors is an integer number (10101110995).

Almost surely, 2^20202221989 is an apocalyptic number.

It is an amenable number.

20202221989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202221989 is an equidigital number, since it uses as much as digits as its factorization.

20202221989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 20202221989 in words is "twenty billion, two hundred two million, two hundred twenty-one thousand, nine hundred eighty-nine".