12121201091 has 8 divisors (see below), whose sum is σ = 12459230784. Its totient is φ = 11785190080.

The previous prime is 12121201087. The next prime is 12121201109. The reversal of 12121201091 is 19010212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12121201091 - 2² = 12121201087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121201051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492491 + ... + 516516.

It is an arithmetic number, because the mean of its divisors is an integer number (1557403848).

Almost surely, 2^12121201091 is an apocalyptic number.

12121201091 is a deficient number, since it is larger than the sum of its proper divisors (338029693).

12121201091 is a wasteful number, since it uses less digits than its factorization.

12121201091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009341.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 12121201091 in words is "twelve billion, one hundred twenty-one million, two hundred one thousand, ninety-one".