1221352443 has 12 divisors (see below), whose sum is σ = 1773319080. Its totient is φ = 810014976.

The previous prime is 1221352427. The next prime is 1221352459. The reversal of 1221352443 is 3442531221.

1221352443 is a `hidden beast` number, since 1 + 2 + 213 + 5 + 2 + 443 = 666.

It is an interprime number because it is at equal distance from previous prime (1221352427) and next prime (1221352459).

It is not a de Polignac number, because 1221352443 - 2⁴ = 1221352427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221352423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 349833 + ... + 353306.

It is an arithmetic number, because the mean of its divisors is an integer number (147776590).

Almost surely, 2^1221352443 is an apocalyptic number.

1221352443 is a deficient number, since it is larger than the sum of its proper divisors (551966637).

1221352443 is a wasteful number, since it uses less digits than its factorization.

1221352443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703338 (or 703335 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 1221352443 is about 34947.8531958688. The cubic root of 1221352443 is about 1068.9244273838.

Adding to 1221352443 its reverse (3442531221), we get a palindrome (4663883664).

The spelling of 1221352443 in words is "one billion, two hundred twenty-one million, three hundred fifty-two thousand, four hundred forty-three".