121221100331291 has 4 divisors (see below), whose sum is σ = 121223218120584. Its totient is φ = 121218982542000.

The previous prime is 121221100331281. The next prime is 121221100331321. The reversal of 121221100331291 is 192133001122121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221100331291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121221100331251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1058808785 + ... + 1058923266.

It is an arithmetic number, because the mean of its divisors is an integer number (30305804530146).

Almost surely, 2^{121221100331291} is an apocalyptic number.

121221100331291 is a deficient number, since it is larger than the sum of its proper divisors (2117789293).

121221100331291 is an equidigital number, since it uses as much as digits as its factorization.

121221100331291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117789292.

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 121221100331291 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, three hundred thirty-one thousand, two hundred ninety-one".