121658881 has 8 divisors (see below), whose sum is σ = 128485280. Its totient is φ = 114874848.

The previous prime is 121658869. The next prime is 121658897. The reversal of 121658881 is 188856121.

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 121658881 - 2¹¹ = 121656833 is a prime.

It is a super-2 number, since 2×121658881² = 29601766652344322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121658821) 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, 4596 + ... + 16261.

It is an arithmetic number, because the mean of its divisors is an integer number (16060660).

Almost surely, 2^121658881 is an apocalyptic number.

It is an amenable number.

121658881 is a deficient number, since it is larger than the sum of its proper divisors (6826399).

121658881 is a wasteful number, since it uses less digits than its factorization.

121658881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21183.

The product of its digits is 30720, while the sum is 40.

The square root of 121658881 is about 11029.9084765015. The cubic root of 121658881 is about 495.5048836291.

The spelling of 121658881 in words is "one hundred twenty-one million, six hundred fifty-eight thousand, eight hundred eighty-one".