121220012121 has 16 divisors (see below), whose sum is σ = 174073796736. Its totient is φ = 74590805376.

The previous prime is 121220012113. The next prime is 121220012129. The reversal of 121220012121 is 121210022121.

It is an interprime number because it is at equal distance from previous prime (121220012113) and next prime (121220012129).

It is not a de Polignac number, because 121220012121 - 2³ = 121220012113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220012121.

It is not an unprimeable number, because it can be changed into a prime (121220012129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378901 + ... + 621293.

It is an arithmetic number, because the mean of its divisors is an integer number (10879612296).

Almost surely, 2^121220012121 is an apocalyptic number.

It is an amenable number.

121220012121 is a deficient number, since it is larger than the sum of its proper divisors (52853784615).

121220012121 is a wasteful number, since it uses less digits than its factorization.

121220012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255232.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121220012121 its reverse (121210022121), we get a palindrome (242430034242).

The spelling of 121220012121 in words is "one hundred twenty-one billion, two hundred twenty million, twelve thousand, one hundred twenty-one".