20221221121999 has 2 divisors, whose sum is σ = 20221221122000. Its totient is φ = 20221221121998.

The previous prime is 20221221121979. The next prime is 20221221122017. The reversal of 20221221121999 is 99912112212202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20221221121999 - 2¹⁵ = 20221221089231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221221121979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110610560999 + 10110610561000.

It is an arithmetic number, because the mean of its divisors is an integer number (10110610561000).

Almost surely, 2^{20221221121999} is an apocalyptic number.

20221221121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221221121999 is an equidigital number, since it uses as much as digits as its factorization.

20221221121999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 20221221121999 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred twenty-one thousand, nine hundred ninety-nine".