20221222199977 has 2 divisors, whose sum is σ = 20221222199978. Its totient is φ = 20221222199976.

The previous prime is 20221222199947. The next prime is 20221222200097. The reversal of 20221222199977 is 77999122212202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20089722408336 + 131499791641 = 4482156^2 + 362629^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221222199977 is a prime.

It is not a weakly prime, because it can be changed into another prime (20221222199947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110611099988 + 10110611099989.

It is an arithmetic number, because the mean of its divisors is an integer number (10110611099989).

Almost surely, 2^{20221222199977} is an apocalyptic number.

It is an amenable number.

20221222199977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221222199977 is an equidigital number, since it uses as much as digits as its factorization.

20221222199977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 20221222199977 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred ninety-nine thousand, nine hundred seventy-seven".