1221333013 has 4 divisors (see below), whose sum is σ = 1221542208. Its totient is φ = 1221123820.

The previous prime is 1221333011. The next prime is 1221333019. The reversal of 1221333013 is 3103331221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221333013 - 2¹ = 1221333011 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 (1221333011) 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, 95581 + ... + 107602.

It is an arithmetic number, because the mean of its divisors is an integer number (305385552).

Almost surely, 2^1221333013 is an apocalyptic number.

It is an amenable number.

1221333013 is a deficient number, since it is larger than the sum of its proper divisors (209195).

1221333013 is an equidigital number, since it uses as much as digits as its factorization.

1221333013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209194.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 1221333013 is about 34947.5752091615. The cubic root of 1221333013 is about 1068.9187589922.

Adding to 1221333013 its reverse (3103331221), we get a palindrome (4324664234).

The spelling of 1221333013 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, thirteen".