21213113201 has 4 divisors (see below), whose sum is σ = 24243557952. Its totient is φ = 18182668452.

The previous prime is 21213113183. The next prime is 21213113203. The reversal of 21213113201 is 10231131212.

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 21213113201 - 2¹⁰ = 21213112177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21213113201.

It is not an unprimeable number, because it can be changed into a prime (21213113203) 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, 1515222365 + ... + 1515222378.

It is an arithmetic number, because the mean of its divisors is an integer number (6060889488).

Almost surely, 2^21213113201 is an apocalyptic number.

It is an amenable number.

21213113201 is a deficient number, since it is larger than the sum of its proper divisors (3030444751).

21213113201 is an equidigital number, since it uses as much as digits as its factorization.

21213113201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030444750.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21213113201 its reverse (10231131212), we get a palindrome (31444244413).

The spelling of 21213113201 in words is "twenty-one billion, two hundred thirteen million, one hundred thirteen thousand, two hundred one".