1221033143 has 24 divisors (see below), whose sum is σ = 1445305680. Its totient is φ = 1026924800.

The previous prime is 1221033127. The next prime is 1221033167. The reversal of 1221033143 is 3413301221.

It is not a de Polignac number, because 1221033143 - 2⁴ = 1221033127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221033103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116333 + ... + 126393.

It is an arithmetic number, because the mean of its divisors is an integer number (60221070).

Almost surely, 2^1221033143 is an apocalyptic number.

1221033143 is a deficient number, since it is larger than the sum of its proper divisors (224272537).

1221033143 is a wasteful number, since it uses less digits than its factorization.

1221033143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10159 (or 10148 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1221033143 is about 34943.2846624355. The cubic root of 1221033143 is about 1068.8312690933.

Adding to 1221033143 its reverse (3413301221), we get a palindrome (4634334364).

The spelling of 1221033143 in words is "one billion, two hundred twenty-one million, thirty-three thousand, one hundred forty-three".