1212121201111 has 8 divisors (see below), whose sum is σ = 1228300323264. Its totient is φ = 1196023999200.

The previous prime is 1212121201087. The next prime is 1212121201133. The reversal of 1212121201111 is 1111021212121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212121201111 - 2⁵ = 1212121201079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212121201141) 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, 20450271 + ... + 20509456.

It is an arithmetic number, because the mean of its divisors is an integer number (153537540408).

Almost surely, 2^{1212121201111} is an apocalyptic number.

1212121201111 is a deficient number, since it is larger than the sum of its proper divisors (16179122153).

1212121201111 is a wasteful number, since it uses less digits than its factorization.

1212121201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40960121.

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

Adding to 1212121201111 its reverse (1111021212121), we get a palindrome (2323142413232).

The spelling of 1212121201111 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred one thousand, one hundred eleven".