121212111 has 16 divisors (see below), whose sum is σ = 166332384. Its totient is φ = 78459264.

The previous prime is 121212103. The next prime is 121212127. The reversal of 121212111 is 111212121.

It is not a de Polignac number, because 121212111 - 2³ = 121212103 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74341 + ... + 75953.

It is an arithmetic number, because the mean of its divisors is an integer number (10395774).

Almost surely, 2^121212111 is an apocalyptic number.

121212111 is a deficient number, since it is larger than the sum of its proper divisors (45120273).

121212111 is a wasteful number, since it uses less digits than its factorization.

121212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330.

The product of its digits is 8, while the sum is 12.

The square root of 121212111 is about 11009.6371874826. The cubic root of 121212111 is about 494.8975892616.

Adding to 121212111 its reverse (111212121), we get a palindrome (232424232).

It can be divided in two parts, 1212121 and 11, that multiplied together give a palindrome (13333331).

The spelling of 121212111 in words is "one hundred twenty-one million, two hundred twelve thousand, one hundred eleven".