91022202121 has 2 divisors, whose sum is σ = 91022202122. Its totient is φ = 91022202120.

The previous prime is 91022202107. The next prime is 91022202133. The reversal of 91022202121 is 12120222019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90051007225 + 971194896 = 300085^2 + 31164^2 .

It is an emirp because it is prime and its reverse (12120222019) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91022202121 - 2⁷ = 91022201993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91022202092 and 91022202101.

It is not a weakly prime, because it can be changed into another prime (91022200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45511101060 + 45511101061.

It is an arithmetic number, because the mean of its divisors is an integer number (45511101061).

Almost surely, 2^91022202121 is an apocalyptic number.

It is an amenable number.

91022202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91022202121 is an equidigital number, since it uses as much as digits as its factorization.

91022202121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 91022202121 in words is "ninety-one billion, twenty-two million, two hundred two thousand, one hundred twenty-one".