1212012221121 has 80 divisors (see below), whose sum is σ = 2069070030720. Its totient is φ = 701332473600.

The previous prime is 1212012221111. The next prime is 1212012221131. The reversal of 1212012221121 is 1211222102121.

1212012221121 is a `hidden beast` number, since 121 + 201 + 2 + 221 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (1212012221111) and next prime (1212012221131).

It is not a de Polignac number, because 1212012221121 - 2²⁹ = 1211475350209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212012221094 and 1212012221103.

It is not an unprimeable number, because it can be changed into a prime (1212012221111) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1004821 + ... + 1853021.

It is an arithmetic number, because the mean of its divisors is an integer number (25863375384).

Almost surely, 2^{1212012221121} is an apocalyptic number.

It is an amenable number.

1212012221121 is a deficient number, since it is larger than the sum of its proper divisors (857057809599).

1212012221121 is a wasteful number, since it uses less digits than its factorization.

1212012221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848308 (or 848299 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212012221121 its reverse (1211222102121), we get a palindrome (2423234323242).

The spelling of 1212012221121 in words is "one trillion, two hundred twelve billion, twelve million, two hundred twenty-one thousand, one hundred twenty-one".