121213291 has 4 divisors (see below), whose sum is σ = 121239784. Its totient is φ = 121186800.

The previous prime is 121213277. The next prime is 121213297. The reversal of 121213291 is 192312121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192312121 = 1049 ⋅183329.

It is a cyclic number.

It is not a de Polignac number, because 121213291 - 2⁷ = 121213163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121213297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4425 + ... + 16186.

It is an arithmetic number, because the mean of its divisors is an integer number (30309946).

Almost surely, 2^121213291 is an apocalyptic number.

121213291 is a deficient number, since it is larger than the sum of its proper divisors (26493).

121213291 is an equidigital number, since it uses as much as digits as its factorization.

121213291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26492.

The product of its digits is 216, while the sum is 22.

The square root of 121213291 is about 11009.6907767657. The cubic root of 121213291 is about 494.8991951992.

The spelling of 121213291 in words is "one hundred twenty-one million, two hundred thirteen thousand, two hundred ninety-one".