220245121 has 2 divisors, whose sum is σ = 220245122. Its totient is φ = 220245120.

The previous prime is 220245119. The next prime is 220245143. The reversal of 220245121 is 121542022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161569521 + 58675600 = 12711^2 + 7660^2 .

It is a cyclic number.

It is not a de Polignac number, because 220245121 - 2¹ = 220245119 is a prime.

Together with 220245119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (220245821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110122560 + 110122561.

It is an arithmetic number, because the mean of its divisors is an integer number (110122561).

Almost surely, 2^220245121 is an apocalyptic number.

It is an amenable number.

220245121 is a deficient number, since it is larger than the sum of its proper divisors (1).

220245121 is an equidigital number, since it uses as much as digits as its factorization.

220245121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 220245121 is about 14840.6577010589. The cubic root of 220245121 is about 603.9051948695.

Adding to 220245121 its reverse (121542022), we get a palindrome (341787143).

The spelling of 220245121 in words is "two hundred twenty million, two hundred forty-five thousand, one hundred twenty-one".