1221021322 has 4 divisors (see below), whose sum is σ = 1831531986. Its totient is φ = 610510660.

The previous prime is 1221021299. The next prime is 1221021337. The reversal of 1221021322 is 2231201221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2231201221 = 43579 ⋅51199.

It can be written as a sum of positive squares in only one way, i.e., 823058721 + 397962601 = 28689^2 + 19949^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221021296 and 1221021305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305255329 + ... + 305255332.

Almost surely, 2^1221021322 is an apocalyptic number.

1221021322 is a deficient number, since it is larger than the sum of its proper divisors (610510664).

1221021322 is an equidigital number, since it uses as much as digits as its factorization.

1221021322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610510663.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221021322 is about 34943.1155165077. The cubic root of 1221021322 is about 1068.8278199117.

Adding to 1221021322 its reverse (2231201221), we get a palindrome (3452222543).

The spelling of 1221021322 in words is "one billion, two hundred twenty-one million, twenty-one thousand, three hundred twenty-two".