121221200100031 has 2 divisors, whose sum is σ = 121221200100032. Its totient is φ = 121221200100030.

The previous prime is 121221200100029. The next prime is 121221200100043. The reversal of 121221200100031 is 130001002122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221200100031 - 2¹ = 121221200100029 is a prime.

It is a super-2 number, since 2×121221200100031² (a number of 29 digits) contains 22 as substring.

Together with 121221200100029, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121221200099978 and 121221200100014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221200700031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610600050015 + 60610600050016.

It is an arithmetic number, because the mean of its divisors is an integer number (60610600050016).

Almost surely, 2^{121221200100031} is an apocalyptic number.

121221200100031 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221200100031 is an equidigital number, since it uses as much as digits as its factorization.

121221200100031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121221200100031 its reverse (130001002122121), we get a palindrome (251222202222152).

The spelling of 121221200100031 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred thousand, thirty-one".