1143215521 has 12 divisors (see below), whose sum is σ = 1335839232. Its totient is φ = 975495528.

The previous prime is 1143215471. The next prime is 1143215531. The reversal of 1143215521 is 1255123411.

It is a de Polignac number, because none of the positive numbers 2^k-1143215521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1143215531) 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, 41385 + ... + 63238.

It is an arithmetic number, because the mean of its divisors is an integer number (111319936).

Almost surely, 2^1143215521 is an apocalyptic number.

It is an amenable number.

1143215521 is a deficient number, since it is larger than the sum of its proper divisors (192623711).

1143215521 is a wasteful number, since it uses less digits than its factorization.

1143215521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104860 (or 104853 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 1143215521 is about 33811.4702578873. The cubic root of 1143215521 is about 1045.6251903269.

Adding to 1143215521 its reverse (1255123411), we get a palindrome (2398338932).

The spelling of 1143215521 in words is "one billion, one hundred forty-three million, two hundred fifteen thousand, five hundred twenty-one".