21223230023 has 4 divisors (see below), whose sum is σ = 21272472288. Its totient is φ = 21173987760.

The previous prime is 21223230019. The next prime is 21223230053. The reversal of 21223230023 is 32003232212.

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 21223230023 - 2² = 21223230019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223229977 and 21223230004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223230053) 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, 24620486 + ... + 24621347.

It is an arithmetic number, because the mean of its divisors is an integer number (5318118072).

Almost surely, 2^21223230023 is an apocalyptic number.

21223230023 is a deficient number, since it is larger than the sum of its proper divisors (49242265).

21223230023 is an equidigital number, since it uses as much as digits as its factorization.

21223230023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49242264.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21223230023 its reverse (32003232212), we get a palindrome (53226462235).

The spelling of 21223230023 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirty thousand, twenty-three".