221021322002077 has 2 divisors, whose sum is σ = 221021322002078. Its totient is φ = 221021322002076.

The previous prime is 221021322002059. The next prime is 221021322002087. The reversal of 221021322002077 is 770200223120122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116010865055556 + 105010456946521 = 10770834^2 + 10247461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021322002077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021322002087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510661001038 + 110510661001039.

It is an arithmetic number, because the mean of its divisors is an integer number (110510661001039).

Almost surely, 2^{221021322002077} is an apocalyptic number.

It is an amenable number.

221021322002077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021322002077 is an equidigital number, since it uses as much as digits as its factorization.

221021322002077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 31.

Adding to 221021322002077 its reverse (770200223120122), we get a palindrome (991221545122199).

The spelling of 221021322002077 in words is "two hundred twenty-one trillion, twenty-one billion, three hundred twenty-two million, two thousand, seventy-seven".