21311113201 has 4 divisors (see below), whose sum is σ = 24355557952. Its totient is φ = 18266668452.

The previous prime is 21311113183. The next prime is 21311113259. The reversal of 21311113201 is 10231111312.

It is a happy number.

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 21311113201 - 2¹¹ = 21311111153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311113801) 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, 1522222365 + ... + 1522222378.

It is an arithmetic number, because the mean of its divisors is an integer number (6088889488).

Almost surely, 2^21311113201 is an apocalyptic number.

It is an amenable number.

21311113201 is a deficient number, since it is larger than the sum of its proper divisors (3044444751).

21311113201 is an equidigital number, since it uses as much as digits as its factorization.

21311113201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044444750.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21311113201 its reverse (10231111312), we get a palindrome (31542224513).

It can be divided in two parts, 2131111 and 3201, that added together give a palindrome (2134312).

The spelling of 21311113201 in words is "twenty-one billion, three hundred eleven million, one hundred thirteen thousand, two hundred one".