121221111 has 8 divisors (see below), whose sum is σ = 176321664. Its totient is φ = 73467320.

The previous prime is 121221103. The next prime is 121221167. The reversal of 121221111 is 111122121.

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 121221111 - 2³ = 121221103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221181) 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, 1836651 + ... + 1836716.

It is an arithmetic number, because the mean of its divisors is an integer number (22040208).

Almost surely, 2^121221111 is an apocalyptic number.

121221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121221111 is a deficient number, since it is larger than the sum of its proper divisors (55100553).

121221111 is a wasteful number, since it uses less digits than its factorization.

121221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673381.

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

The square root of 121221111 is about 11010.0459127108. The cubic root of 121221111 is about 494.9098376748.

Adding to 121221111 its reverse (111122121), we get a palindrome (232343232).

The spelling of 121221111 in words is "one hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".