1212021111123 has 48 divisors (see below), whose sum is σ = 1817539027200. Its totient is φ = 777850741440.

The previous prime is 1212021111113. The next prime is 1212021111131. The reversal of 1212021111123 is 3211111202121.

It is a happy number.

It is not a de Polignac number, because 1212021111123 - 2²⁵ = 1211987556691 is a prime.

It is a super-2 number, since 2×1212021111123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212021111096 and 1212021111105.

It is not an unprimeable number, because it can be changed into a prime (1212021111113) 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 47 ways as a sum of consecutive naturals, for example, 7270338 + ... + 7435176.

It is an arithmetic number, because the mean of its divisors is an integer number (37865396400).

Almost surely, 2^{1212021111123} is an apocalyptic number.

1212021111123 is a deficient number, since it is larger than the sum of its proper divisors (605517916077).

1212021111123 is a wasteful number, since it uses less digits than its factorization.

1212021111123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165192 (or 165189 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1212021111123 its reverse (3211111202121), we get a palindrome (4423132313244).

The spelling of 1212021111123 in words is "one trillion, two hundred twelve billion, twenty-one million, one hundred eleven thousand, one hundred twenty-three".