21131333201233 has 4 divisors (see below), whose sum is σ = 21349181997220. Its totient is φ = 20913484405248.

The previous prime is 21131333201221. The next prime is 21131333201267. The reversal of 21131333201233 is 33210233313112.

It is a happy number.

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 8219046804544 + 12912286396689 = 2866888^2 + 3593367^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131333201233 - 2¹⁷ = 21131333070161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131333201203) 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, 108924397848 + ... + 108924398041.

It is an arithmetic number, because the mean of its divisors is an integer number (5337295499305).

Almost surely, 2^{21131333201233} is an apocalyptic number.

It is an amenable number.

21131333201233 is a deficient number, since it is larger than the sum of its proper divisors (217848795987).

21131333201233 is an equidigital number, since it uses as much as digits as its factorization.

21131333201233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217848795986.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21131333201233 its reverse (33210233313112), we get a palindrome (54341566514345).

The spelling of 21131333201233 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred thirty-three million, two hundred one thousand, two hundred thirty-three".