121212002221111 has 4 divisors (see below), whose sum is σ = 127591581285400. Its totient is φ = 114832423156824.

The previous prime is 121212002221097. The next prime is 121212002221151. The reversal of 121212002221111 is 111122200212121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121212002221111 - 2¹⁹ = 121212001696823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 6379579064269 = 121212002221111 / (1 + 2 + 1 + 2 + 1 + 2 + 0 + 0 + 2 + 2 + 2 + 1 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212002221151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3189789532116 + ... + 3189789532153.

It is an arithmetic number, because the mean of its divisors is an integer number (31897895321350).

Almost surely, 2^{121212002221111} is an apocalyptic number.

121212002221111 is a deficient number, since it is larger than the sum of its proper divisors (6379579064289).

121212002221111 is an equidigital number, since it uses as much as digits as its factorization.

121212002221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379579064288.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121212002221111 its reverse (111122200212121), we get a palindrome (232334202433232).

The spelling of 121212002221111 in words is "one hundred twenty-one trillion, two hundred twelve billion, two million, two hundred twenty-one thousand, one hundred eleven".