12121221013 has 16 divisors (see below), whose sum is σ = 13264329600. Its totient is φ = 10985042880.

The previous prime is 12121221011. The next prime is 12121221041. The reversal of 12121221013 is 31012212121.

It is a cyclic number.

It is not a de Polignac number, because 12121221013 - 2¹ = 12121221011 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 (12121221011) 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, 6774523 + ... + 6776311.

It is an arithmetic number, because the mean of its divisors is an integer number (829020600).

Almost surely, 2^12121221013 is an apocalyptic number.

It is an amenable number.

12121221013 is a deficient number, since it is larger than the sum of its proper divisors (1143108587).

12121221013 is a wasteful number, since it uses less digits than its factorization.

12121221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12121221013 its reverse (31012212121), we get a palindrome (43133433134).

The spelling of 12121221013 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, thirteen".