12122157 has 4 divisors (see below), whose sum is σ = 16162880. Its totient is φ = 8081436.

The previous prime is 12122153. The next prime is 12122167. The reversal of 12122157 is 75122121.

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.

It is not a de Polignac number, because 12122157 - 2² = 12122153 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 (12122153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020357 + ... + 2020362.

It is an arithmetic number, because the mean of its divisors is an integer number (4040720).

Almost surely, 2^12122157 is an apocalyptic number.

It is an amenable number.

12122157 is a deficient number, since it is larger than the sum of its proper divisors (4040723).

12122157 is an equidigital number, since it uses as much as digits as its factorization.

12122157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040722.

The product of its digits is 280, while the sum is 21.

The square root of 12122157 is about 3481.6888143543. The cubic root of 12122157 is about 229.7170875578.

Adding to 12122157 its reverse (75122121), we get a palindrome (87244278).

It can be divided in two parts, 121221 and 57, that added together give a triangular number (121278 = T₄₉₂).

The spelling of 12122157 in words is "twelve million, one hundred twenty-two thousand, one hundred fifty-seven".