21230220023 has 16 divisors (see below), whose sum is σ = 21914081280. Its totient is φ = 20556440256.

The previous prime is 21230220001. The next prime is 21230220029. The reversal of 21230220023 is 32002203212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21230220023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230219983 and 21230220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230220029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7778123 + ... + 7780851.

It is an arithmetic number, because the mean of its divisors is an integer number (1369630080).

Almost surely, 2^21230220023 is an apocalyptic number.

21230220023 is a deficient number, since it is larger than the sum of its proper divisors (683861257).

21230220023 is a wasteful number, since it uses less digits than its factorization.

21230220023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4486.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21230220023 its reverse (32002203212), we get a palindrome (53232423235).

The spelling of 21230220023 in words is "twenty-one billion, two hundred thirty million, two hundred twenty thousand, twenty-three".