1321021233 has 18 divisors (see below), whose sum is σ = 2219675874. Its totient is φ = 754869024.

The previous prime is 1321021231. The next prime is 1321021241. The reversal of 1321021233 is 3321201231.

It can be written as a sum of positive squares in only one way, i.e., 1240237089 + 80784144 = 35217^2 + 8988^2 .

It is not a de Polignac number, because 1321021233 - 2¹ = 1321021231 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321021231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1497316 + ... + 1498197.

Almost surely, 2^1321021233 is an apocalyptic number.

It is an amenable number.

1321021233 is a deficient number, since it is larger than the sum of its proper divisors (898654641).

1321021233 is a wasteful number, since it uses less digits than its factorization.

1321021233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995533 (or 2995523 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1321021233 is about 36345.8557885215. The cubic root of 1321021233 is about 1097.2441297581.

Adding to 1321021233 its reverse (3321201231), we get a palindrome (4642222464).

It can be divided in two parts, 13210 and 21233, that added together give a palindrome (34443).

The spelling of 1321021233 in words is "one billion, three hundred twenty-one million, twenty-one thousand, two hundred thirty-three".