21212333115033 has 4 divisors (see below), whose sum is σ = 28283110820048. Its totient is φ = 14141555410020.

The previous prime is 21212333115007. The next prime is 21212333115089. The reversal of 21212333115033 is 33051133321212.

It is a happy number.

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 de Polignac number, because none of the positive numbers 2^k-21212333115033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212333114033) 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, 3535388852503 + ... + 3535388852508.

It is an arithmetic number, because the mean of its divisors is an integer number (7070777705012).

Almost surely, 2^{21212333115033} is an apocalyptic number.

It is an amenable number.

21212333115033 is a deficient number, since it is larger than the sum of its proper divisors (7070777705015).

21212333115033 is an equidigital number, since it uses as much as digits as its factorization.

21212333115033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070777705014.

The product of its (nonzero) digits is 9720, while the sum is 30.

Adding to 21212333115033 its reverse (33051133321212), we get a palindrome (54263466436245).

The spelling of 21212333115033 in words is "twenty-one trillion, two hundred twelve billion, three hundred thirty-three million, one hundred fifteen thousand, thirty-three".