245131222121 has 4 divisors (see below), whose sum is σ = 245138239632. Its totient is φ = 245124204612.

The previous prime is 245131222109. The next prime is 245131222139. The reversal of 245131222121 is 121222131542.

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: 121222131542 = 2 ⋅60611065771.

It is a cyclic number.

It is not a de Polignac number, because 245131222121 - 2⁶ = 245131222057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245131222151) 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, 3456095 + ... + 3526308.

It is an arithmetic number, because the mean of its divisors is an integer number (61284559908).

Almost surely, 2^245131222121 is an apocalyptic number.

It is an amenable number.

245131222121 is a deficient number, since it is larger than the sum of its proper divisors (7017511).

245131222121 is an equidigital number, since it uses as much as digits as its factorization.

245131222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7017510.

The product of its digits is 1920, while the sum is 26.

Adding to 245131222121 its reverse (121222131542), we get a palindrome (366353353663).

The spelling of 245131222121 in words is "two hundred forty-five billion, one hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".