100122220021991 has 2 divisors, whose sum is σ = 100122220021992. Its totient is φ = 100122220021990.

The previous prime is 100122220021933. The next prime is 100122220022129. The reversal of 100122220021991 is 199120022221001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100122220021991 - 2²⁶ = 100122152913127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100122220024991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50061110010995 + 50061110010996.

It is an arithmetic number, because the mean of its divisors is an integer number (50061110010996).

Almost surely, 2^{100122220021991} is an apocalyptic number.

100122220021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100122220021991 is an equidigital number, since it uses as much as digits as its factorization.

100122220021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

Adding to 100122220021991 its reverse (199120022221001), we get a palindrome (299242242242992).

The spelling of 100122220021991 in words is "one hundred trillion, one hundred twenty-two billion, two hundred twenty million, twenty-one thousand, nine hundred ninety-one".