20221021999 has 2 divisors, whose sum is σ = 20221022000. Its totient is φ = 20221021998.

The previous prime is 20221021969. The next prime is 20221022027. The reversal of 20221021999 is 99912012202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20221021999 - 2²³ = 20212633391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221021949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110510999 + 10110511000.

It is an arithmetic number, because the mean of its divisors is an integer number (10110511000).

Almost surely, 2^20221021999 is an apocalyptic number.

20221021999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221021999 is an equidigital number, since it uses as much as digits as its factorization.

20221021999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The spelling of 20221021999 in words is "twenty billion, two hundred twenty-one million, twenty-one thousand, nine hundred ninety-nine".