12121111215 has 16 divisors (see below), whose sum is σ = 21548642400. Its totient is φ = 6464592576.

The previous prime is 12121111207. The next prime is 12121111243. The reversal of 12121111215 is 51211112121.

It is a happy number.

It is not a de Polignac number, because 12121111215 - 2³ = 12121111207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44892870 + ... + 44893139.

It is an arithmetic number, because the mean of its divisors is an integer number (1346790150).

Almost surely, 2^12121111215 is an apocalyptic number.

12121111215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12121111215 is a deficient number, since it is larger than the sum of its proper divisors (9427531185).

12121111215 is an equidigital number, since it uses as much as digits as its factorization.

12121111215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89786023 (or 89786017 counting only the distinct ones).

The product of its digits is 40, while the sum is 18.

Adding to 12121111215 its reverse (51211112121), we get a palindrome (63332223336).

The spelling of 12121111215 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred fifteen".