121011161 has 4 divisors (see below), whose sum is σ = 121513524. Its totient is φ = 120508800.

The previous prime is 121011109. The next prime is 121011181. The reversal of 121011161 is 161110121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161110121 = 43 ⋅3746747.

It can be written as a sum of positive squares in 2 ways, for example, as 39000025 + 82011136 = 6245^2 + 9056^2 .

It is a cyclic number.

It is not a de Polignac number, because 121011161 - 2⁶ = 121011097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121011101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250820 + ... + 251301.

It is an arithmetic number, because the mean of its divisors is an integer number (30378381).

Almost surely, 2^121011161 is an apocalyptic number.

It is an amenable number.

121011161 is a deficient number, since it is larger than the sum of its proper divisors (502363).

121011161 is an equidigital number, since it uses as much as digits as its factorization.

121011161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502362.

The product of its (nonzero) digits is 12, while the sum is 14.

The square root of 121011161 is about 11000.5073064836. The cubic root of 121011161 is about 494.6239513730.

Adding to 121011161 its reverse (161110121), we get a palindrome (282121282).

The spelling of 121011161 in words is "one hundred twenty-one million, eleven thousand, one hundred sixty-one".