21220304023 has 4 divisors (see below), whose sum is σ = 21270949560. Its totient is φ = 21169658488.

The previous prime is 21220304003. The next prime is 21220304029. The reversal of 21220304023 is 32040302212.

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 21220304023 - 2¹⁷ = 21220172951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220304029) 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, 25322140 + ... + 25322977.

It is an arithmetic number, because the mean of its divisors is an integer number (5317737390).

Almost surely, 2^21220304023 is an apocalyptic number.

21220304023 is a deficient number, since it is larger than the sum of its proper divisors (50645537).

21220304023 is an equidigital number, since it uses as much as digits as its factorization.

21220304023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50645536.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21220304023 its reverse (32040302212), we get a palindrome (53260606235).

The spelling of 21220304023 in words is "twenty-one billion, two hundred twenty million, three hundred four thousand, twenty-three".