2221021949977 has 2 divisors, whose sum is σ = 2221021949978. Its totient is φ = 2221021949976.

The previous prime is 2221021949921. The next prime is 2221021950011. The reversal of 2221021949977 is 7799491201222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2220424831881 + 597118096 = 1490109^2 + 24436^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221021949977 - 2¹¹ = 2221021947929 is a prime.

It is not a weakly prime, because it can be changed into another prime (2221021949477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110510974988 + 1110510974989.

It is an arithmetic number, because the mean of its divisors is an integer number (1110510974989).

Almost surely, 2^{2221021949977} is an apocalyptic number.

It is an amenable number.

2221021949977 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221021949977 is an equidigital number, since it uses as much as digits as its factorization.

2221021949977 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 2221021949977 in words is "two trillion, two hundred twenty-one billion, twenty-one million, nine hundred forty-nine thousand, nine hundred seventy-seven".