21132222012221 has 8 divisors (see below), whose sum is σ = 21136183132320. Its totient is φ = 21128261170608.

The previous prime is 21132222012203. The next prime is 21132222012323. The reversal of 21132222012221 is 12221022223112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21132222012221 - 2²² = 21132217817917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132222015221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205781330 + ... + 205883996.

It is an arithmetic number, because the mean of its divisors is an integer number (2642022891540).

Almost surely, 2^{21132222012221} is an apocalyptic number.

It is an amenable number.

21132222012221 is a deficient number, since it is larger than the sum of its proper divisors (3961120099).

21132222012221 is a wasteful number, since it uses less digits than its factorization.

21132222012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139243.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21132222012221 its reverse (12221022223112), we get a palindrome (33353244235333).

The spelling of 21132222012221 in words is "twenty-one trillion, one hundred thirty-two billion, two hundred twenty-two million, twelve thousand, two hundred twenty-one".