21223203023 has 32 divisors (see below), whose sum is σ = 24752217600. Its totient is φ = 18013968000.

The previous prime is 21223203013. The next prime is 21223203047. The reversal of 21223203023 is 32030232212.

It is a cyclic number.

It is not a de Polignac number, because 21223203023 - 2¹⁴ = 21223186639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223202986 and 21223203004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223203013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1377758 + ... + 1393076.

It is an arithmetic number, because the mean of its divisors is an integer number (773506800).

Almost surely, 2^21223203023 is an apocalyptic number.

21223203023 is a deficient number, since it is larger than the sum of its proper divisors (3529014577).

21223203023 is a wasteful number, since it uses less digits than its factorization.

21223203023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15503.

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

Adding to 21223203023 its reverse (32030232212), we get a palindrome (53253435235).

The spelling of 21223203023 in words is "twenty-one billion, two hundred twenty-three million, two hundred three thousand, twenty-three".