1221442273 has 2 divisors, whose sum is σ = 1221442274. Its totient is φ = 1221442272.

The previous prime is 1221442267. The next prime is 1221442283. The reversal of 1221442273 is 3722441221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1137847824 + 83594449 = 33732^2 + 9143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221442273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221442283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610721136 + 610721137.

It is an arithmetic number, because the mean of its divisors is an integer number (610721137).

Almost surely, 2^1221442273 is an apocalyptic number.

It is an amenable number.

1221442273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221442273 is an equidigital number, since it uses as much as digits as its factorization.

1221442273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 28.

The square root of 1221442273 is about 34949.1383727840. The cubic root of 1221442273 is about 1068.9506330674.

Adding to 1221442273 its reverse (3722441221), we get a palindrome (4943883494).

The spelling of 1221442273 in words is "one billion, two hundred twenty-one million, four hundred forty-two thousand, two hundred seventy-three".