21023113201 has 4 divisors (see below), whose sum is σ = 21024595312. Its totient is φ = 21021631092.

The previous prime is 21023113193. The next prime is 21023113247. The reversal of 21023113201 is 10231132012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21023113201 - 2³ = 21023113193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023113271) 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, 719571 + ... + 748216.

It is an arithmetic number, because the mean of its divisors is an integer number (5256148828).

Almost surely, 2^21023113201 is an apocalyptic number.

It is an amenable number.

21023113201 is a deficient number, since it is larger than the sum of its proper divisors (1482111).

21023113201 is a wasteful number, since it uses less digits than its factorization.

21023113201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482110.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21023113201 its reverse (10231132012), we get a palindrome (31254245213).

It can be divided in two parts, 2 and 1023113201, that multiplied together give a palindrome (2046226402).

The spelling of 21023113201 in words is "twenty-one billion, twenty-three million, one hundred thirteen thousand, two hundred one".