21210303231 has 96 divisors (see below), whose sum is σ = 36588464640. Its totient is φ = 11714326272.

The previous prime is 21210303221. The next prime is 21210303251. The reversal of 21210303231 is 13230301212.

It is not a de Polignac number, because 21210303231 - 2⁹ = 21210302719 is a prime.

It is a super-2 number, since 2×21210303231² (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 (21210303221) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5468865 + ... + 5472741.

It is an arithmetic number, because the mean of its divisors is an integer number (381129840).

Almost surely, 2^21210303231 is an apocalyptic number.

21210303231 is a deficient number, since it is larger than the sum of its proper divisors (15378161409).

21210303231 is a wasteful number, since it uses less digits than its factorization.

21210303231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4045 (or 4042 counting only the distinct ones).

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

Adding to 21210303231 its reverse (13230301212), we get a palindrome (34440604443).

The spelling of 21210303231 in words is "twenty-one billion, two hundred ten million, three hundred three thousand, two hundred thirty-one".