245444124421 has 2 divisors, whose sum is σ = 245444124422. Its totient is φ = 245444124420.

The previous prime is 245444124391. The next prime is 245444124461. The reversal of 245444124421 is 124421444542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220628423521 + 24815700900 = 469711^2 + 157530^2 .

It is a cyclic number.

It is not a de Polignac number, because 245444124421 - 2¹⁹ = 245443600133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245444124461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122722062210 + 122722062211.

It is an arithmetic number, because the mean of its divisors is an integer number (122722062211).

Almost surely, 2^245444124421 is an apocalyptic number.

It is an amenable number.

245444124421 is a deficient number, since it is larger than the sum of its proper divisors (1).

245444124421 is an equidigital number, since it uses as much as digits as its factorization.

245444124421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163840, while the sum is 37.

Adding to 245444124421 its reverse (124421444542), we get a palindrome (369865568963).

The spelling of 245444124421 in words is "two hundred forty-five billion, four hundred forty-four million, one hundred twenty-four thousand, four hundred twenty-one".