21323000222021 has 4 divisors (see below), whose sum is σ = 21323142514944. Its totient is φ = 21322857929100.

The previous prime is 21323000222011. The next prime is 21323000222059. The reversal of 21323000222021 is 12022200032312.

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 a de Polignac number, because none of the positive numbers 2^k-21323000222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323000221984 and 21323000222002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323000222011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70921445 + ... + 71221466.

It is an arithmetic number, because the mean of its divisors is an integer number (5330785628736).

Almost surely, 2^{21323000222021} is an apocalyptic number.

It is an amenable number.

21323000222021 is a deficient number, since it is larger than the sum of its proper divisors (142292923).

21323000222021 is a wasteful number, since it uses less digits than its factorization.

21323000222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142292922.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21323000222021 its reverse (12022200032312), we get a palindrome (33345200254333).

The spelling of 21323000222021 in words is "twenty-one trillion, three hundred twenty-three billion, two hundred twenty-two thousand, twenty-one".