101221121101091 has 2 divisors, whose sum is σ = 101221121101092. Its totient is φ = 101221121101090.

The previous prime is 101221121101039. The next prime is 101221121101147. The reversal of 101221121101091 is 190101121122101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101221121101091 - 2⁴² = 96823074589987 is a prime.

It is not a weakly prime, because it can be changed into another prime (101221121101021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610560550545 + 50610560550546.

It is an arithmetic number, because the mean of its divisors is an integer number (50610560550546).

Almost surely, 2^{101221121101091} is an apocalyptic number.

101221121101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221121101091 is an equidigital number, since it uses as much as digits as its factorization.

101221121101091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 23.

Adding to 101221121101091 its reverse (190101121122101), we get a palindrome (291322242223192).

The spelling of 101221121101091 in words is "one hundred one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, ninety-one".