20221222199777 has 2 divisors, whose sum is σ = 20221222199778. Its totient is φ = 20221222199776.

The previous prime is 20221222199767. The next prime is 20221222199779. The reversal of 20221222199777 is 77799122212202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12111263055376 + 8109959144401 = 3480124^2 + 2847799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221222199777 - 2⁴² = 15823175688673 is a prime.

Together with 20221222199779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20221222199779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110611099888 + 10110611099889.

It is an arithmetic number, because the mean of its divisors is an integer number (10110611099889).

Almost surely, 2^{20221222199777} is an apocalyptic number.

It is an amenable number.

20221222199777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221222199777 is an equidigital number, since it uses as much as digits as its factorization.

20221222199777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The spelling of 20221222199777 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred ninety-nine thousand, seven hundred seventy-seven".