121657111 has 4 divisors (see below), whose sum is σ = 122838352. Its totient is φ = 120475872.

The previous prime is 121657099. The next prime is 121657139. The reversal of 121657111 is 111756121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111756121 = 691 ⋅161731.

It is a cyclic number.

It is not a de Polignac number, because 121657111 - 2⁵ = 121657079 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 (121627111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590466 + ... + 590671.

It is an arithmetic number, because the mean of its divisors is an integer number (30709588).

Almost surely, 2^121657111 is an apocalyptic number.

121657111 is a deficient number, since it is larger than the sum of its proper divisors (1181241).

121657111 is a wasteful number, since it uses less digits than its factorization.

121657111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181240.

The product of its digits is 420, while the sum is 25.

The square root of 121657111 is about 11029.8282398231. The cubic root of 121657111 is about 495.5024806044.

The spelling of 121657111 in words is "one hundred twenty-one million, six hundred fifty-seven thousand, one hundred eleven".