21020222023 has 4 divisors (see below), whose sum is σ = 21020653368. Its totient is φ = 21019790680.

The previous prime is 21020221997. The next prime is 21020222029. The reversal of 21020222023 is 32022202012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020222023 - 2⁹ = 21020221511 is a prime.

It is a super-3 number, since 3×21020222023³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020221988 and 21020222006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020222029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131668 + ... + 243673.

It is an arithmetic number, because the mean of its divisors is an integer number (5255163342).

Almost surely, 2^21020222023 is an apocalyptic number.

21020222023 is a deficient number, since it is larger than the sum of its proper divisors (431345).

21020222023 is an equidigital number, since it uses as much as digits as its factorization.

21020222023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431344.

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21020222023 its reverse (32022202012), we get a palindrome (53042424035).

The spelling of 21020222023 in words is "twenty-one billion, twenty million, two hundred twenty-two thousand, twenty-three".