21202222023 has 6 divisors (see below), whose sum is σ = 30625431824. Its totient is φ = 14134814676.

The previous prime is 21202222021. The next prime is 21202222039. The reversal of 21202222023 is 32022220212.

It is not a de Polignac number, because 21202222023 - 2¹ = 21202222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202221987 and 21202222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202222021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1177901215 + ... + 1177901232.

Almost surely, 2^21202222023 is an apocalyptic number.

21202222023 is a deficient number, since it is larger than the sum of its proper divisors (9423209801).

21202222023 is a wasteful number, since it uses less digits than its factorization.

21202222023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355802453 (or 2355802450 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21202222023 its reverse (32022220212), we get a palindrome (53224442235).

The spelling of 21202222023 in words is "twenty-one billion, two hundred two million, two hundred twenty-two thousand, twenty-three".