221211212099077 has 2 divisors, whose sum is σ = 221211212099078. Its totient is φ = 221211212099076.

The previous prime is 221211212098993. The next prime is 221211212099107. The reversal of 221211212099077 is 770990212112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184547714807556 + 36663497291521 = 13584834^2 + 6055039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211212099077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211212099177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605606049538 + 110605606049539.

It is an arithmetic number, because the mean of its divisors is an integer number (110605606049539).

Almost surely, 2^{221211212099077} is an apocalyptic number.

It is an amenable number.

221211212099077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211212099077 is an equidigital number, since it uses as much as digits as its factorization.

221211212099077 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 46.

The spelling of 221211212099077 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twelve million, ninety-nine thousand, seventy-seven".