1212020111121 has 8 divisors (see below), whose sum is σ = 1616892396384. Its totient is φ = 807580616640.

The previous prime is 1212020111119. The next prime is 1212020111123. The reversal of 1212020111121 is 1211110202121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1212020111119) and next prime (1212020111123).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212020111121 - 2¹ = 1212020111119 is a prime.

It is a super-2 number, since 2×1212020111121² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212020111121.

It is not an unprimeable number, because it can be changed into a prime (1212020111123) 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 7 ways as a sum of consecutive naturals, for example, 108191160 + ... + 108202361.

It is an arithmetic number, because the mean of its divisors is an integer number (202111549548).

Almost surely, 2^{1212020111121} is an apocalyptic number.

It is an amenable number.

1212020111121 is a deficient number, since it is larger than the sum of its proper divisors (404872285263).

1212020111121 is a wasteful number, since it uses less digits than its factorization.

1212020111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216395391.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1212020111121 its reverse (1211110202121), we get a palindrome (2423130313242).

The spelling of 1212020111121 in words is "one trillion, two hundred twelve billion, twenty million, one hundred eleven thousand, one hundred twenty-one".