221211222100901 has 2 divisors, whose sum is σ = 221211222100902. Its totient is φ = 221211222100900.

The previous prime is 221211222100861. The next prime is 221211222101011. The reversal of 221211222100901 is 109001222112122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219271681230625 + 1939540870276 = 14807825^2 + 1392674^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211222100901 - 2¹⁰ = 221211222099877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211222102901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605611050450 + 110605611050451.

It is an arithmetic number, because the mean of its divisors is an integer number (110605611050451).

Almost surely, 2^{221211222100901} is an apocalyptic number.

It is an amenable number.

221211222100901 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211222100901 is an equidigital number, since it uses as much as digits as its factorization.

221211222100901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 221211222100901 in words is "two hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred thousand, nine hundred one".