121020181 has 4 divisors (see below), whose sum is σ = 126281952. Its totient is φ = 115758412.

The previous prime is 121020173. The next prime is 121020191. The reversal of 121020181 is 181020121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181020121 = 4423 ⋅40927.

It is a cyclic number.

It is not a de Polignac number, because 121020181 - 2³ = 121020173 is a prime.

It is a super-2 number, since 2×121020181² = 29291768418545522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020131) 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, 2630851 + ... + 2630896.

It is an arithmetic number, because the mean of its divisors is an integer number (31570488).

Almost surely, 2^121020181 is an apocalyptic number.

It is an amenable number.

121020181 is a deficient number, since it is larger than the sum of its proper divisors (5261771).

121020181 is an equidigital number, since it uses as much as digits as its factorization.

121020181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5261770.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 121020181 is about 11000.9172799363. The cubic root of 121020181 is about 494.6362405898.

The spelling of 121020181 in words is "one hundred twenty-one million, twenty thousand, one hundred eighty-one".