221200940977 has 2 divisors, whose sum is σ = 221200940978. Its totient is φ = 221200940976.

The previous prime is 221200940971. The next prime is 221200940993. The reversal of 221200940977 is 779049002122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157608206001 + 63592734976 = 396999^2 + 252176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221200940977 is a prime.

It is a super-2 number, since 2×221200940977² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221200940971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600470488 + 110600470489.

It is an arithmetic number, because the mean of its divisors is an integer number (110600470489).

Almost surely, 2^221200940977 is an apocalyptic number.

It is an amenable number.

221200940977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200940977 is an equidigital number, since it uses as much as digits as its factorization.

221200940977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 221200940977 in words is "two hundred twenty-one billion, two hundred million, nine hundred forty thousand, nine hundred seventy-seven".