1212122111 has 8 divisors (see below), whose sum is σ = 1224197904. Its totient is φ = 1200101760.

The previous prime is 1212122071. The next prime is 1212122113. The reversal of 1212122111 is 1112212121.

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 1212122111 - 2⁶ = 1212122047 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 (1212122113) 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 7 ways as a sum of consecutive naturals, for example, 30791 + ... + 58071.

It is an arithmetic number, because the mean of its divisors is an integer number (153024738).

Almost surely, 2^1212122111 is an apocalyptic number.

1212122111 is a deficient number, since it is larger than the sum of its proper divisors (12075793).

1212122111 is a wasteful number, since it uses less digits than its factorization.

1212122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27721.

The product of its digits is 16, while the sum is 14.

The square root of 1212122111 is about 34815.5441003009. The cubic root of 1212122111 is about 1066.2248278232.

Adding to 1212122111 its reverse (1112212121), we get a palindrome (2324334232).

The spelling of 1212122111 in words is "one billion, two hundred twelve million, one hundred twenty-two thousand, one hundred eleven".