21233432525221 has 4 divisors (see below), whose sum is σ = 24266780028832. Its totient is φ = 18200085021612.

The previous prime is 21233432525219. The next prime is 21233432525233. The reversal of 21233432525221 is 12252523433212.

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 21233432525221 - 2¹ = 21233432525219 is a prime.

It is a super-2 number, since 2×21233432525221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233432525521) 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, 1516673751795 + ... + 1516673751808.

It is an arithmetic number, because the mean of its divisors is an integer number (6066695007208).

Almost surely, 2^{21233432525221} is an apocalyptic number.

It is an amenable number.

21233432525221 is a deficient number, since it is larger than the sum of its proper divisors (3033347503611).

21233432525221 is an equidigital number, since it uses as much as digits as its factorization.

21233432525221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033347503610.

The product of its digits is 172800, while the sum is 37.

Adding to 21233432525221 its reverse (12252523433212), we get a palindrome (33485955958433).

The spelling of 21233432525221 in words is "twenty-one trillion, two hundred thirty-three billion, four hundred thirty-two million, five hundred twenty-five thousand, two hundred twenty-one".