222120221977 has 2 divisors, whose sum is σ = 222120221978. Its totient is φ = 222120221976.

The previous prime is 222120221969. The next prime is 222120222013. The reversal of 222120221977 is 779122021222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219338608896 + 2781613081 = 468336^2 + 52741^2 .

It is a cyclic number.

It is not a de Polignac number, because 222120221977 - 2³ = 222120221969 is a prime.

It is a super-2 number, since 2×222120221977² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (222120221077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060110988 + 111060110989.

It is an arithmetic number, because the mean of its divisors is an integer number (111060110989).

Almost surely, 2^222120221977 is an apocalyptic number.

It is an amenable number.

222120221977 is a deficient number, since it is larger than the sum of its proper divisors (1).

222120221977 is an equidigital number, since it uses as much as digits as its factorization.

222120221977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 222120221977 in words is "two hundred twenty-two billion, one hundred twenty million, two hundred twenty-one thousand, nine hundred seventy-seven".