21332331221 has 8 divisors (see below), whose sum is σ = 22590446400. Its totient is φ = 20074579648.

The previous prime is 21332331217. The next prime is 21332331233. The reversal of 21332331221 is 12213323312.

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 21332331221 - 2² = 21332331217 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 (21332331521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34880 + ... + 209478.

It is an arithmetic number, because the mean of its divisors is an integer number (2823805800).

Almost surely, 2^21332331221 is an apocalyptic number.

It is an amenable number.

21332331221 is a deficient number, since it is larger than the sum of its proper divisors (1258115179).

21332331221 is a wasteful number, since it uses less digits than its factorization.

21332331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181803.

The product of its digits is 1296, while the sum is 23.

Adding to 21332331221 its reverse (12213323312), we get a palindrome (33545654533).

The spelling of 21332331221 in words is "twenty-one billion, three hundred thirty-two million, three hundred thirty-one thousand, two hundred twenty-one".