21203230331 has 6 divisors (see below), whose sum is σ = 22523847060. Its totient is φ = 19955981216.

The previous prime is 21203230313. The next prime is 21203230361. The reversal of 21203230331 is 13303230212.

It is not a de Polignac number, because 21203230331 - 2²⁶ = 21136121467 is a prime.

It is a super-2 number, since 2×21203230331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21203230361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36683501 + ... + 36684078.

It is an arithmetic number, because the mean of its divisors is an integer number (3753974510).

Almost surely, 2^21203230331 is an apocalyptic number.

21203230331 is a deficient number, since it is larger than the sum of its proper divisors (1320616729).

21203230331 is an equidigital number, since it uses as much as digits as its factorization.

21203230331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73367613 (or 73367596 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21203230331 its reverse (13303230212), we get a palindrome (34506460543).

The spelling of 21203230331 in words is "twenty-one billion, two hundred three million, two hundred thirty thousand, three hundred thirty-one".