21022313221 has 8 divisors (see below), whose sum is σ = 25873616384. Its totient is φ = 16633038960.

The previous prime is 21022313209. The next prime is 21022313243. The reversal of 21022313221 is 12231322012.

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 21022313221 - 2⁷ = 21022313093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022313281) 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, 115507125 + ... + 115507306.

It is an arithmetic number, because the mean of its divisors is an integer number (3234202048).

Almost surely, 2^21022313221 is an apocalyptic number.

It is an amenable number.

21022313221 is a deficient number, since it is larger than the sum of its proper divisors (4851303163).

21022313221 is a wasteful number, since it uses less digits than its factorization.

21022313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231014451.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21022313221 its reverse (12231322012), we get a palindrome (33253635233).

The spelling of 21022313221 in words is "twenty-one billion, twenty-two million, three hundred thirteen thousand, two hundred twenty-one".