12121149 has 4 divisors (see below), whose sum is σ = 16161536. Its totient is φ = 8080764.

The previous prime is 12121147. The next prime is 12121157. The reversal of 12121149 is 94112121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94112121 = 3 ⋅31370707.

It is not a de Polignac number, because 12121149 - 2¹ = 12121147 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 (12121147) 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, 2020189 + ... + 2020194.

It is an arithmetic number, because the mean of its divisors is an integer number (4040384).

Almost surely, 2^12121149 is an apocalyptic number.

It is an amenable number.

12121149 is a deficient number, since it is larger than the sum of its proper divisors (4040387).

12121149 is an equidigital number, since it uses as much as digits as its factorization.

12121149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040386.

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

The square root of 12121149 is about 3481.5440540082. The cubic root of 12121149 is about 229.7107201200.

The spelling of 12121149 in words is "twelve million, one hundred twenty-one thousand, one hundred forty-nine".