20220021091 has 2 divisors, whose sum is σ = 20220021092. Its totient is φ = 20220021090.

The previous prime is 20220021079. The next prime is 20220021113. The reversal of 20220021091 is 19012002202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20220021091 - 2¹⁵ = 20219988323 is a prime.

It is not a weakly prime, because it can be changed into another prime (20220021061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110010545 + 10110010546.

It is an arithmetic number, because the mean of its divisors is an integer number (10110010546).

Almost surely, 2^20220021091 is an apocalyptic number.

20220021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220021091 is an equidigital number, since it uses as much as digits as its factorization.

20220021091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 20220021091 its reverse (19012002202), we get a palindrome (39232023293).

The spelling of 20220021091 in words is "twenty billion, two hundred twenty million, twenty-one thousand, ninety-one".