21201120023 has 8 divisors (see below), whose sum is σ = 21588204288. Its totient is φ = 20817170424.

The previous prime is 21201119993. The next prime is 21201120043. The reversal of 21201120023 is 32002110212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21201120023 - 2²⁰ = 21200071447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201120043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770015 + ... + 797072.

It is an arithmetic number, because the mean of its divisors is an integer number (2698525536).

Almost surely, 2^21201120023 is an apocalyptic number.

21201120023 is a deficient number, since it is larger than the sum of its proper divisors (387084265).

21201120023 is a wasteful number, since it uses less digits than its factorization.

21201120023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567333.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21201120023 its reverse (32002110212), we get a palindrome (53203230235).

The spelling of 21201120023 in words is "twenty-one billion, two hundred one million, one hundred twenty thousand, twenty-three".