21330201231 has 32 divisors (see below), whose sum is σ = 32235952320. Its totient is φ = 13934748672.

The previous prime is 21330201229. The next prime is 21330201239. The reversal of 21330201231 is 13210203312.

It is not a de Polignac number, because 21330201231 - 2¹ = 21330201229 is a prime.

It is a super-2 number, since 2×21330201231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330201239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1217671 + ... + 1235063.

It is an arithmetic number, because the mean of its divisors is an integer number (1007373510).

Almost surely, 2^21330201231 is an apocalyptic number.

21330201231 is a deficient number, since it is larger than the sum of its proper divisors (10905751089).

21330201231 is a wasteful number, since it uses less digits than its factorization.

21330201231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18312 (or 18306 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21330201231 its reverse (13210203312), we get a palindrome (34540404543).

The spelling of 21330201231 in words is "twenty-one billion, three hundred thirty million, two hundred one thousand, two hundred thirty-one".