21022333221 has 16 divisors (see below), whose sum is σ = 28325557440. Its totient is φ = 13867768320.

The previous prime is 21022333187. The next prime is 21022333223. The reversal of 21022333221 is 12233322012.

It is a happy number.

It is not a de Polignac number, because 21022333221 - 2¹¹ = 21022331173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022333223) 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, 13525 + ... + 205493.

It is an arithmetic number, because the mean of its divisors is an integer number (1770347340).

Almost surely, 2^21022333221 is an apocalyptic number.

It is an amenable number.

21022333221 is a deficient number, since it is larger than the sum of its proper divisors (7303224219).

21022333221 is a wasteful number, since it uses less digits than its factorization.

21022333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192356.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21022333221 its reverse (12233322012), we get a palindrome (33255655233).

The spelling of 21022333221 in words is "twenty-one billion, twenty-two million, three hundred thirty-three thousand, two hundred twenty-one".