220245240521 has 2 divisors, whose sum is σ = 220245240522. Its totient is φ = 220245240520.

The previous prime is 220245240503. The next prime is 220245240547. The reversal of 220245240521 is 125042542022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126743832121 + 93501408400 = 356011^2 + 305780^2 .

It is a cyclic number.

It is not a de Polignac number, because 220245240521 - 2¹⁸ = 220244978377 is a prime.

It is not a weakly prime, because it can be changed into another prime (220245243521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110122620260 + 110122620261.

It is an arithmetic number, because the mean of its divisors is an integer number (110122620261).

Almost surely, 2^220245240521 is an apocalyptic number.

It is an amenable number.

220245240521 is a deficient number, since it is larger than the sum of its proper divisors (1).

220245240521 is an equidigital number, since it uses as much as digits as its factorization.

220245240521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 220245240521 its reverse (125042542022), we get a palindrome (345287782543).

The spelling of 220245240521 in words is "two hundred twenty billion, two hundred forty-five million, two hundred forty thousand, five hundred twenty-one".