1212200121111 has 8 divisors (see below), whose sum is σ = 1847162089344. Its totient is φ = 692685783480.

The previous prime is 1212200121101. The next prime is 1212200121127. The reversal of 1212200121111 is 1111210022121.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1212200121111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212200121101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28861907625 + ... + 28861907666.

It is an arithmetic number, because the mean of its divisors is an integer number (230895261168).

Almost surely, 2^{1212200121111} is an apocalyptic number.

1212200121111 is a deficient number, since it is larger than the sum of its proper divisors (634961968233).

1212200121111 is an equidigital number, since it uses as much as digits as its factorization.

1212200121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57723815301.

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

Adding to 1212200121111 its reverse (1111210022121), we get a palindrome (2323410143232).

The spelling of 1212200121111 in words is "one trillion, two hundred twelve billion, two hundred million, one hundred twenty-one thousand, one hundred eleven".