1221011343 has 12 divisors (see below), whose sum is σ = 1775521800. Its totient is φ = 808543536.

The previous prime is 1221011303. The next prime is 1221011357. The reversal of 1221011343 is 3431101221.

It is not a de Polignac number, because 1221011343 - 2¹² = 1221007247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011303) 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, 453921 + ... + 456602.

It is an arithmetic number, because the mean of its divisors is an integer number (147960150).

Almost surely, 2^1221011343 is an apocalyptic number.

1221011343 is a deficient number, since it is larger than the sum of its proper divisors (554510457).

1221011343 is a wasteful number, since it uses less digits than its factorization.

1221011343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910678 (or 910675 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1221011343 is about 34942.9727270019. The cubic root of 1221011343 is about 1068.8249081794.

Adding to 1221011343 its reverse (3431101221), we get a palindrome (4652112564).

The spelling of 1221011343 in words is "one billion, two hundred twenty-one million, eleven thousand, three hundred forty-three".