121023191 has 4 divisors (see below), whose sum is σ = 121049712. Its totient is φ = 120996672.

The previous prime is 121023169. The next prime is 121023209. The reversal of 121023191 is 191320121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191320121 = 1489 ⋅128489.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121023191 is a prime.

It is a super-2 number, since 2×121023191² = 29293225519644962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121023491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4475 + ... + 16188.

It is an arithmetic number, because the mean of its divisors is an integer number (30262428).

Almost surely, 2^121023191 is an apocalyptic number.

121023191 is a deficient number, since it is larger than the sum of its proper divisors (26521).

121023191 is an equidigital number, since it uses as much as digits as its factorization.

121023191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26520.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 121023191 is about 11001.0540858592. The cubic root of 121023191 is about 494.6403414010.

The spelling of 121023191 in words is "one hundred twenty-one million, twenty-three thousand, one hundred ninety-one".