245112121 has 4 divisors (see below), whose sum is σ = 249736932. Its totient is φ = 240487312.

The previous prime is 245112073. The next prime is 245112139. The reversal of 245112121 is 121211542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121211542 = 2 ⋅60605771.

It can be written as a sum of positive squares in 2 ways, for example, as 122345721 + 122766400 = 11061^2 + 11080^2 .

It is a cyclic number.

It is not a de Polignac number, because 245112121 - 2¹⁷ = 244981049 is a prime.

It is a super-2 number, since 2×245112121² = 120159903722237282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245112151) 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, 2312326 + ... + 2312431.

It is an arithmetic number, because the mean of its divisors is an integer number (62434233).

Almost surely, 2^245112121 is an apocalyptic number.

It is an amenable number.

245112121 is a deficient number, since it is larger than the sum of its proper divisors (4624811).

245112121 is an equidigital number, since it uses as much as digits as its factorization.

245112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4624810.

The product of its digits is 160, while the sum is 19.

The square root of 245112121 is about 15656.0570067945. The cubic root of 245112121 is about 625.8279127326.

Adding to 245112121 its reverse (121211542), we get a palindrome (366323663).

The spelling of 245112121 in words is "two hundred forty-five million, one hundred twelve thousand, one hundred twenty-one".