121212112142 has 8 divisors (see below), whose sum is σ = 198347092632. Its totient is φ = 55096414600.

The previous prime is 121212112129. The next prime is 121212112157. The reversal of 121212112142 is 241211212121.

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

It is a super-2 number, since 2×121212112142² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2754820709 + ... + 2754820752.

It is an arithmetic number, because the mean of its divisors is an integer number (24793386579).

Almost surely, 2^121212112142 is an apocalyptic number.

121212112142 is a deficient number, since it is larger than the sum of its proper divisors (77134980490).

121212112142 is a wasteful number, since it uses less digits than its factorization.

121212112142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5509641474.

The product of its digits is 128, while the sum is 20.

Adding to 121212112142 its reverse (241211212121), we get a palindrome (362423324263).

The spelling of 121212112142 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, one hundred forty-two".