21022002321 has 4 divisors (see below), whose sum is σ = 28029336432. Its totient is φ = 14014668212.

The previous prime is 21022002319. The next prime is 21022002377. The reversal of 21022002321 is 12320022012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21022002321 - 2¹ = 21022002319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21022002321.

It is not an unprimeable number, because it can be changed into a prime (21022022321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503667051 + ... + 3503667056.

It is an arithmetic number, because the mean of its divisors is an integer number (7007334108).

Almost surely, 2^21022002321 is an apocalyptic number.

It is an amenable number.

21022002321 is a deficient number, since it is larger than the sum of its proper divisors (7007334111).

21022002321 is an equidigital number, since it uses as much as digits as its factorization.

21022002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007334110.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21022002321 its reverse (12320022012), we get a palindrome (33342024333).

The spelling of 21022002321 in words is "twenty-one billion, twenty-two million, two thousand, three hundred twenty-one".