20221221200989 has 2 divisors, whose sum is σ = 20221221200990. Its totient is φ = 20221221200988.

The previous prime is 20221221200941. The next prime is 20221221201029. The reversal of 20221221200989 is 98900212212202.

It is an a-pointer prime, because the next prime (20221221201029) can be obtained adding 20221221200989 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19584536895364 + 636684305625 = 4425442^2 + 797925^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221221200989 - 2⁷ = 20221221200861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20221221290989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110610600494 + 10110610600495.

It is an arithmetic number, because the mean of its divisors is an integer number (10110610600495).

Almost surely, 2^{20221221200989} is an apocalyptic number.

It is an amenable number.

20221221200989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221221200989 is an equidigital number, since it uses as much as digits as its factorization.

20221221200989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 20221221200989 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, nine hundred eighty-nine".