12121101015 has 16 divisors (see below), whose sum is σ = 20414486400. Its totient is φ = 6124345632.

The previous prime is 12121101011. The next prime is 12121101073. The reversal of 12121101015 is 51010112121.

It is not a de Polignac number, because 12121101015 - 2² = 12121101011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 12121100985 and 12121101003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21264805 + ... + 21265374.

It is an arithmetic number, because the mean of its divisors is an integer number (1275905400).

Almost surely, 2^12121101015 is an apocalyptic number.

12121101015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12121101015 is a deficient number, since it is larger than the sum of its proper divisors (8293385385).

12121101015 is a wasteful number, since it uses less digits than its factorization.

12121101015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42530206.

The product of its (nonzero) digits is 20, while the sum is 15.

Adding to 12121101015 its reverse (51010112121), we get a palindrome (63131213136).

The spelling of 12121101015 in words is "twelve billion, one hundred twenty-one million, one hundred one thousand, fifteen".