21320020212223 has 4 divisors (see below), whose sum is σ = 21368146669128. Its totient is φ = 21271893755320.

The previous prime is 21320020212163. The next prime is 21320020212277. The reversal of 21320020212223 is 32221202002312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21320020212223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320020212194 and 21320020212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320020222223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24063227788 + ... + 24063228673.

It is an arithmetic number, because the mean of its divisors is an integer number (5342036667282).

Almost surely, 2^{21320020212223} is an apocalyptic number.

21320020212223 is a deficient number, since it is larger than the sum of its proper divisors (48126456905).

21320020212223 is an equidigital number, since it uses as much as digits as its factorization.

21320020212223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48126456904.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21320020212223 its reverse (32221202002312), we get a palindrome (53541222214535).

The spelling of 21320020212223 in words is "twenty-one trillion, three hundred twenty billion, twenty million, two hundred twelve thousand, two hundred twenty-three".