21212321331233 has 4 divisors (see below), whose sum is σ = 21213423346500. Its totient is φ = 21211219315968.

The previous prime is 21212321331217. The next prime is 21212321331241. The reversal of 21212321331233 is 33213312321212.

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 6680115806464 + 14532205524769 = 2584592^2 + 3812113^2 .

It is a cyclic number.

It is not a de Polignac number, because 21212321331233 - 2⁴ = 21212321331217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212321331196 and 21212321331205.

It is not an unprimeable number, because it can be changed into a prime (21212321336233) 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, 550978760 + ... + 551017257.

It is an arithmetic number, because the mean of its divisors is an integer number (5303355836625).

Almost surely, 2^{21212321331233} is an apocalyptic number.

It is an amenable number.

21212321331233 is a deficient number, since it is larger than the sum of its proper divisors (1102015267).

21212321331233 is a wasteful number, since it uses less digits than its factorization.

21212321331233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102015266.

The product of its digits is 7776, while the sum is 29.

Adding to 21212321331233 its reverse (33213312321212), we get a palindrome (54425633652445).

The spelling of 21212321331233 in words is "twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-three".