21313220201 has 24 divisors (see below), whose sum is σ = 26422974720. Its totient is φ = 16833038976.

The previous prime is 21313220177. The next prime is 21313220207. The reversal of 21313220201 is 10202231312.

It is not a de Polignac number, because 21313220201 - 2¹⁴ = 21313203817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21313220201.

It is not an unprimeable number, because it can be changed into a prime (21313220207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 657296 + ... + 688958.

It is an arithmetic number, because the mean of its divisors is an integer number (1100957280).

Almost surely, 2^21313220201 is an apocalyptic number.

It is an amenable number.

21313220201 is a deficient number, since it is larger than the sum of its proper divisors (5109754519).

21313220201 is a wasteful number, since it uses less digits than its factorization.

21313220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32265 (or 32252 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21313220201 its reverse (10202231312), we get a palindrome (31515451513).

The spelling of 21313220201 in words is "twenty-one billion, three hundred thirteen million, two hundred twenty thousand, two hundred one".