1213100033 has 4 divisors (see below), whose sum is σ = 1238910720. Its totient is φ = 1187289348.

The previous prime is 1213100027. The next prime is 1213100081. The reversal of 1213100033 is 3300013121.

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 1213100033 - 2²⁰ = 1212051457 is a prime.

It is a super-2 number, since 2×1213100033² = 2943223380129202178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213099990 and 1213100017.

It is not an unprimeable number, because it can be changed into a prime (1213100023) 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, 12905273 + ... + 12905366.

It is an arithmetic number, because the mean of its divisors is an integer number (309727680).

Almost surely, 2^1213100033 is an apocalyptic number.

It is an amenable number.

1213100033 is a deficient number, since it is larger than the sum of its proper divisors (25810687).

1213100033 is an equidigital number, since it uses as much as digits as its factorization.

1213100033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25810686.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 1213100033 is about 34829.5855990277. The cubic root of 1213100033 is about 1066.5114888300.

Adding to 1213100033 its reverse (3300013121), we get a palindrome (4513113154).

The spelling of 1213100033 in words is "one billion, two hundred thirteen million, one hundred thousand, thirty-three".