21201022023 has 4 divisors (see below), whose sum is σ = 28268029368. Its totient is φ = 14134014680.

The previous prime is 21201021991. The next prime is 21201022033. The reversal of 21201022023 is 32022010212.

It is a happy number.

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 21201022023 - 2⁵ = 21201021991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201021993 and 21201022011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201022033) 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, 3533503668 + ... + 3533503673.

It is an arithmetic number, because the mean of its divisors is an integer number (7067007342).

Almost surely, 2^21201022023 is an apocalyptic number.

21201022023 is a deficient number, since it is larger than the sum of its proper divisors (7067007345).

21201022023 is an equidigital number, since it uses as much as digits as its factorization.

21201022023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067007344.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21201022023 its reverse (32022010212), we get a palindrome (53223032235).

The spelling of 21201022023 in words is "twenty-one billion, two hundred one million, twenty-two thousand, twenty-three".