1221233113 has 8 divisors (see below), whose sum is σ = 1301782400. Its totient is φ = 1142311248.

The previous prime is 1221233089. The next prime is 1221233119. The reversal of 1221233113 is 3113321221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221233113 - 2⁵ = 1221233081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221233119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405306 + ... + 408307.

It is an arithmetic number, because the mean of its divisors is an integer number (162722800).

Almost surely, 2^1221233113 is an apocalyptic number.

It is an amenable number.

1221233113 is a deficient number, since it is larger than the sum of its proper divisors (80549287).

1221233113 is an equidigital number, since it uses as much as digits as its factorization.

1221233113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813711.

The product of its digits is 216, while the sum is 19.

The square root of 1221233113 is about 34946.1458962215. The cubic root of 1221233113 is about 1068.8896138165.

Adding to 1221233113 its reverse (3113321221), we get a palindrome (4334554334).

It can be divided in two parts, 122 and 1233113, that added together give a triangular number (1233235 = T₁₅₇₀).

The spelling of 1221233113 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, one hundred thirteen".