23213202021 has 20 divisors (see below), whose sum is σ = 34745512032. Its totient is φ = 15444674568.

The previous prime is 23213201993. The next prime is 23213202049. The reversal of 23213202021 is 12020231232.

23213202021 is a `hidden beast` number, since 2 + 321 + 320 + 2 + 0 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (23213201993) and next prime (23213202049).

It is not a de Polignac number, because 23213202021 - 2⁹ = 23213201509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23213201985 and 23213202003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213202421) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 244131 + ... + 325616.

Almost surely, 2^23213202021 is an apocalyptic number.

It is an amenable number.

23213202021 is a deficient number, since it is larger than the sum of its proper divisors (11532310011).

23213202021 is an equidigital number, since it uses as much as digits as its factorization.

23213202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570262 (or 570253 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 23213202021 its reverse (12020231232), we get a palindrome (35233433253).

The spelling of 23213202021 in words is "twenty-three billion, two hundred thirteen million, two hundred two thousand, twenty-one".