12122157312 has 108 divisors (see below), whose sum is σ = 35218847664. Its totient is φ = 4009774080.

The previous prime is 12122157253. The next prime is 12122157329. The reversal of 12122157312 is 21375122121.

It is a happy number.

12122157312 is a `hidden beast` number, since 121 + 221 + 5 + 7 + 312 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 281743 + ... + 321905.

Almost surely, 2^12122157312 is an apocalyptic number.

12122157312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12122157312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17609423832).

12122157312 is an abundant number, since it is smaller than the sum of its proper divisors (23096690352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12122157312 is a wasteful number, since it uses less digits than its factorization.

12122157312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40316 (or 40299 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

Adding to 12122157312 its reverse (21375122121), we get a palindrome (33497279433).

The spelling of 12122157312 in words is "twelve billion, one hundred twenty-two million, one hundred fifty-seven thousand, three hundred twelve".