21022344521 has 8 divisors (see below), whose sum is σ = 21136742400. Its totient is φ = 20907992160.

The previous prime is 21022344487. The next prime is 21022344523. The reversal of 21022344521 is 12544322012.

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 21022344521 - 2³⁰ = 19948602697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022344523) 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, 1353920 + ... + 1369358.

It is an arithmetic number, because the mean of its divisors is an integer number (2642092800).

Almost surely, 2^21022344521 is an apocalyptic number.

It is an amenable number.

21022344521 is a deficient number, since it is larger than the sum of its proper divisors (114397879).

21022344521 is a wasteful number, since it uses less digits than its factorization.

21022344521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22759.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21022344521 its reverse (12544322012), we get a palindrome (33566666533).

The spelling of 21022344521 in words is "twenty-one billion, twenty-two million, three hundred forty-four thousand, five hundred twenty-one".