121222191 has 4 divisors (see below), whose sum is σ = 161629592. Its totient is φ = 80814792.

The previous prime is 121222187. The next prime is 121222193. The reversal of 121222191 is 191222121.

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

It is not a de Polignac number, because 121222191 - 2² = 121222187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121222193) 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, 20203696 + ... + 20203701.

It is an arithmetic number, because the mean of its divisors is an integer number (40407398).

Almost surely, 2^121222191 is an apocalyptic number.

121222191 is a deficient number, since it is larger than the sum of its proper divisors (40407401).

121222191 is an equidigital number, since it uses as much as digits as its factorization.

121222191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40407400.

The product of its digits is 144, while the sum is 21.

The square root of 121222191 is about 11010.0949587186. The cubic root of 121222191 is about 494.9113074436.

The spelling of 121222191 in words is "one hundred twenty-one million, two hundred twenty-two thousand, one hundred ninety-one".