245231351221 has 2 divisors, whose sum is σ = 245231351222. Its totient is φ = 245231351220.

The previous prime is 245231351159. The next prime is 245231351273. The reversal of 245231351221 is 122153132542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165982908100 + 79248443121 = 407410^2 + 281511^2 .

It is a cyclic number.

It is not a de Polignac number, because 245231351221 - 2¹⁹ = 245230826933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245231351821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122615675610 + 122615675611.

It is an arithmetic number, because the mean of its divisors is an integer number (122615675611).

Almost surely, 2^245231351221 is an apocalyptic number.

It is an amenable number.

245231351221 is a deficient number, since it is larger than the sum of its proper divisors (1).

245231351221 is an equidigital number, since it uses as much as digits as its factorization.

245231351221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 31.

Adding to 245231351221 its reverse (122153132542), we get a palindrome (367384483763).

The spelling of 245231351221 in words is "two hundred forty-five billion, two hundred thirty-one million, three hundred fifty-one thousand, two hundred twenty-one".