21030303231 has 24 divisors (see below), whose sum is σ = 34970111904. Its totient is φ = 11929593600.

The previous prime is 21030303227. The next prime is 21030303251. The reversal of 21030303231 is 13230303012.

It is not a de Polignac number, because 21030303231 - 2² = 21030303227 is a prime.

It is a super-3 number, since 3×21030303231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030303221) 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, 1209670 + ... + 1226931.

It is an arithmetic number, because the mean of its divisors is an integer number (1457087996).

Almost surely, 2^21030303231 is an apocalyptic number.

21030303231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21030303231 is a deficient number, since it is larger than the sum of its proper divisors (13939808673).

21030303231 is a wasteful number, since it uses less digits than its factorization.

21030303231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436751 (or 2436748 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21030303231 its reverse (13230303012), we get a palindrome (34260606243).

The spelling of 21030303231 in words is "twenty-one billion, thirty million, three hundred three thousand, two hundred thirty-one".