121212000023111 has 4 divisors (see below), whose sum is σ = 121213248685824. Its totient is φ = 121210751360400.

The previous prime is 121212000023099. The next prime is 121212000023119. The reversal of 121212000023111 is 111320000212121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121212000023111 is a prime.

It is a super-2 number, since 2×121212000023111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121212000023111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212000023119) 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, 624185735 + ... + 624379896.

It is an arithmetic number, because the mean of its divisors is an integer number (30303312171456).

Almost surely, 2^{121212000023111} is an apocalyptic number.

121212000023111 is a deficient number, since it is larger than the sum of its proper divisors (1248662713).

121212000023111 is an equidigital number, since it uses as much as digits as its factorization.

121212000023111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248662712.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 121212000023111 its reverse (111320000212121), we get a palindrome (232532000235232).

The spelling of 121212000023111 in words is "one hundred twenty-one trillion, two hundred twelve billion, twenty-three thousand, one hundred eleven".