245206121 has 4 divisors (see below), whose sum is σ = 245588112. Its totient is φ = 244824132.

The previous prime is 245206111. The next prime is 245206123. The reversal of 245206121 is 121602542.

It is a happy number.

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: 121602542 = 2 ⋅60801271.

It is a cyclic number.

It is not a de Polignac number, because 245206121 - 2¹⁸ = 244943977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245206123) 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, 190031 + ... + 191316.

It is an arithmetic number, because the mean of its divisors is an integer number (61397028).

Almost surely, 2^245206121 is an apocalyptic number.

It is an amenable number.

245206121 is a deficient number, since it is larger than the sum of its proper divisors (381991).

245206121 is an equidigital number, since it uses as much as digits as its factorization.

245206121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381990.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 245206121 is about 15659.0587520451. The cubic root of 245206121 is about 625.9079037520.

Adding to 245206121 its reverse (121602542), we get a palindrome (366808663).

The spelling of 245206121 in words is "two hundred forty-five million, two hundred six thousand, one hundred twenty-one".