121161111 has 8 divisors (see below), whose sum is σ = 161610624. Its totient is φ = 80742840.

The previous prime is 121161077. The next prime is 121161121. The reversal of 121161111 is 111161121.

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

It is not a de Polignac number, because 121161111 - 2¹¹ = 121159063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121161121) 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, 3640 + ... + 15986.

It is an arithmetic number, because the mean of its divisors is an integer number (20201328).

Almost surely, 2^121161111 is an apocalyptic number.

121161111 is a deficient number, since it is larger than the sum of its proper divisors (40449513).

121161111 is a wasteful number, since it uses less digits than its factorization.

121161111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15621.

The product of its digits is 12, while the sum is 15.

The square root of 121161111 is about 11007.3207911826. The cubic root of 121161111 is about 494.8281701319.

The spelling of 121161111 in words is "one hundred twenty-one million, one hundred sixty-one thousand, one hundred eleven".