1212121033 has 4 divisors (see below), whose sum is σ = 1253918340. Its totient is φ = 1170323728.

The previous prime is 1212120991. The next prime is 1212121037. The reversal of 1212121033 is 3301212121.

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 471628089 + 740492944 = 21717^2 + 27212^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212121033 - 2²⁵ = 1178566601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212120998 and 1212121016.

It is not an unprimeable number, because it can be changed into a prime (1212121037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20898610 + ... + 20898667.

It is an arithmetic number, because the mean of its divisors is an integer number (313479585).

Almost surely, 2^1212121033 is an apocalyptic number.

It is an amenable number.

1212121033 is a deficient number, since it is larger than the sum of its proper divisors (41797307).

1212121033 is an equidigital number, since it uses as much as digits as its factorization.

1212121033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41797306.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1212121033 is about 34815.5286187069. The cubic root of 1212121033 is about 1066.2245117410.

Adding to 1212121033 its reverse (3301212121), we get a palindrome (4513333154).

The spelling of 1212121033 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, thirty-three".