21200311231 has 8 divisors (see below), whose sum is σ = 23519606400. Its totient is φ = 18946348440.

The previous prime is 21200311229. The next prime is 21200311241. The reversal of 21200311231 is 13211300212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200311231 - 2¹ = 21200311229 is a prime.

It is a super-2 number, since 2×21200311231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200311241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16332411 + ... + 16333708.

It is an arithmetic number, because the mean of its divisors is an integer number (2939950800).

Almost surely, 2^21200311231 is an apocalyptic number.

21200311231 is a deficient number, since it is larger than the sum of its proper divisors (2319295169).

21200311231 is a wasteful number, since it uses less digits than its factorization.

21200311231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32666189.

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

Adding to 21200311231 its reverse (13211300212), we get a palindrome (34411611443).

The spelling of 21200311231 in words is "twenty-one billion, two hundred million, three hundred eleven thousand, two hundred thirty-one".