21200001331 has 4 divisors (see below), whose sum is σ = 21201721632. Its totient is φ = 21198281032.

The previous prime is 21200001281. The next prime is 21200001359. The reversal of 21200001331 is 13310000212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200001331 - 2²⁷ = 21065783603 is a prime.

It is a super-2 number, since 2×21200001331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200007331) 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, 841531 + ... + 866356.

It is an arithmetic number, because the mean of its divisors is an integer number (5300430408).

Almost surely, 2^21200001331 is an apocalyptic number.

21200001331 is a deficient number, since it is larger than the sum of its proper divisors (1720301).

21200001331 is a wasteful number, since it uses less digits than its factorization.

21200001331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720300.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21200001331 its reverse (13310000212), we get a palindrome (34510001543).

The spelling of 21200001331 in words is "twenty-one billion, two hundred million, one thousand, three hundred thirty-one".