1213221033 has 12 divisors (see below), whose sum is σ = 1772121780. Its totient is φ = 799725696.

The previous prime is 1213221029. The next prime is 1213221067. The reversal of 1213221033 is 3301223121.

It can be written as a sum of positive squares in 2 ways, for example, as 675584064 + 537636969 = 25992^2 + 23187^2 .

It is not a de Polignac number, because 1213221033 - 2² = 1213221029 is a prime.

It is a super-3 number, since 3×1213221033³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213220997 and 1213221015.

It is not an unprimeable number, because it can be changed into a prime (1213221013) 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, 756516 + ... + 758117.

It is an arithmetic number, because the mean of its divisors is an integer number (147676815).

Almost surely, 2^1213221033 is an apocalyptic number.

It is an amenable number.

1213221033 is a deficient number, since it is larger than the sum of its proper divisors (558900747).

1213221033 is a wasteful number, since it uses less digits than its factorization.

1213221033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514728 (or 1514725 counting only the distinct ones).

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

The square root of 1213221033 is about 34831.3225847081. The cubic root of 1213221033 is about 1066.5469471864.

Adding to 1213221033 its reverse (3301223121), we get a palindrome (4514444154).

The spelling of 1213221033 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, thirty-three".