21233000131221 has 16 divisors (see below), whose sum is σ = 29031161943168. Its totient is φ = 13795799942400.

The previous prime is 21233000131219. The next prime is 21233000131237. The reversal of 21233000131221 is 12213100033212.

It is not a de Polignac number, because 21233000131221 - 2¹ = 21233000131219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233000132221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89139600 + ... + 89377481.

It is an arithmetic number, because the mean of its divisors is an integer number (1814447621448).

Almost surely, 2^{21233000131221} is an apocalyptic number.

It is an amenable number.

21233000131221 is a deficient number, since it is larger than the sum of its proper divisors (7798161811947).

21233000131221 is a wasteful number, since it uses less digits than its factorization.

21233000131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178518092.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21233000131221 its reverse (12213100033212), we get a palindrome (33446100164433).

The spelling of 21233000131221 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred thirty-one thousand, two hundred twenty-one".