100121021121091 has 2 divisors, whose sum is σ = 100121021121092. Its totient is φ = 100121021121090.

The previous prime is 100121021121073. The next prime is 100121021121097. The reversal of 100121021121091 is 190121120121001.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (190121120121001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100121021121091 - 2³⁵ = 100086661382723 is a prime.

It is not a weakly prime, because it can be changed into another prime (100121021121097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060510560545 + 50060510560546.

It is an arithmetic number, because the mean of its divisors is an integer number (50060510560546).

Almost surely, 2^{100121021121091} is an apocalyptic number.

100121021121091 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121021121091 is an equidigital number, since it uses as much as digits as its factorization.

100121021121091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

Adding to 100121021121091 its reverse (190121120121001), we get a palindrome (290242141242092).

The spelling of 100121021121091 in words is "one hundred trillion, one hundred twenty-one billion, twenty-one million, one hundred twenty-one thousand, ninety-one".