12151221121 has 8 divisors (see below), whose sum is σ = 13855691304. Its totient is φ = 10556716800.

The previous prime is 12151221077. The next prime is 12151221133. The reversal of 12151221121 is 12112215121.

It can be written as a sum of positive squares in 4 ways, for example, as 5455890496 + 6695330625 = 73864^2 + 81825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12151221121 - 2³¹ = 10003737473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12151221151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27491230 + ... + 27491671.

It is an arithmetic number, because the mean of its divisors is an integer number (1731961413).

Almost surely, 2^12151221121 is an apocalyptic number.

It is an amenable number.

12151221121 is a deficient number, since it is larger than the sum of its proper divisors (1704470183).

12151221121 is a wasteful number, since it uses less digits than its factorization.

12151221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54982931.

The product of its digits is 80, while the sum is 19.

Adding to 12151221121 its reverse (12112215121), we get a palindrome (24263436242).

The spelling of 12151221121 in words is "twelve billion, one hundred fifty-one million, two hundred twenty-one thousand, one hundred twenty-one".