1221013033 has 4 divisors (see below), whose sum is σ = 1221211348. Its totient is φ = 1220814720.

The previous prime is 1221013007. The next prime is 1221013051. The reversal of 1221013033 is 3303101221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 722964544 + 498048489 = 26888^2 + 22317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221013033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221012998 and 1221013016.

It is not an unprimeable number, because it can be changed into a prime (1221010033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89616 + ... + 102337.

It is an arithmetic number, because the mean of its divisors is an integer number (305302837).

Almost surely, 2^1221013033 is an apocalyptic number.

It is an amenable number.

1221013033 is a deficient number, since it is larger than the sum of its proper divisors (198315).

1221013033 is an equidigital number, since it uses as much as digits as its factorization.

1221013033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198314.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1221013033 is about 34942.9969092521. The cubic root of 1221013033 is about 1068.8254012988.

Adding to 1221013033 its reverse (3303101221), we get a palindrome (4524114254).

The spelling of 1221013033 in words is "one billion, two hundred twenty-one million, thirteen thousand, thirty-three".