121023205 has 4 divisors (see below), whose sum is σ = 145227852. Its totient is φ = 96818560.

The previous prime is 121023169. The next prime is 121023209. The reversal of 121023205 is 502320121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502320121 = 257 ⋅1954553.

It can be written as a sum of positive squares in 2 ways, for example, as 79459396 + 41563809 = 8914^2 + 6447^2 .

It is not a de Polignac number, because 121023205 - 2¹¹ = 121021157 is a prime.

It is a super-2 number, since 2×121023205² = 29293232296944050, 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 (121023209) 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, 12102316 + ... + 12102325.

It is an arithmetic number, because the mean of its divisors is an integer number (36306963).

Almost surely, 2^121023205 is an apocalyptic number.

It is an amenable number.

121023205 is a deficient number, since it is larger than the sum of its proper divisors (24204647).

121023205 is an equidigital number, since it uses as much as digits as its factorization.

121023205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24204646.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 121023205 is about 11001.0547221619. The cubic root of 121023205 is about 494.6403604744.

Adding to 121023205 its reverse (502320121), we get a palindrome (623343326).

The spelling of 121023205 in words is "one hundred twenty-one million, twenty-three thousand, two hundred five".