1221154322 has 4 divisors (see below), whose sum is σ = 1831731486. Its totient is φ = 610577160.

The previous prime is 1221154309. The next prime is 1221154331. The reversal of 1221154322 is 2234511221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2234511221 = 1597 ⋅1399193.

It can be written as a sum of positive squares in only one way, i.e., 1043225401 + 177928921 = 32299^2 + 13339^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305288579 + ... + 305288582.

Almost surely, 2^1221154322 is an apocalyptic number.

1221154322 is a deficient number, since it is larger than the sum of its proper divisors (610577164).

1221154322 is an equidigital number, since it uses as much as digits as its factorization.

1221154322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610577163.

The product of its digits is 960, while the sum is 23.

The square root of 1221154322 is about 34945.0185577287. The cubic root of 1221154322 is about 1068.8666259332.

Adding to 1221154322 its reverse (2234511221), we get a palindrome (3455665543).

The spelling of 1221154322 in words is "one billion, two hundred twenty-one million, one hundred fifty-four thousand, three hundred twenty-two".