221200220101877 has 2 divisors, whose sum is σ = 221200220101878. Its totient is φ = 221200220101876.

The previous prime is 221200220101859. The next prime is 221200220102119. The reversal of 221200220101877 is 778101022002122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219133960474276 + 2066259627601 = 14803174^2 + 1437449^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200220101877 - 2⁶ = 221200220101813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221200220101477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600110050938 + 110600110050939.

It is an arithmetic number, because the mean of its divisors is an integer number (110600110050939).

Almost surely, 2^{221200220101877} is an apocalyptic number.

It is an amenable number.

221200220101877 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200220101877 is an equidigital number, since it uses as much as digits as its factorization.

221200220101877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

Adding to 221200220101877 its reverse (778101022002122), we get a palindrome (999301242103999).

The spelling of 221200220101877 in words is "two hundred twenty-one trillion, two hundred billion, two hundred twenty million, one hundred one thousand, eight hundred seventy-seven".