21203032231 has 2 divisors, whose sum is σ = 21203032232. Its totient is φ = 21203032230.

The previous prime is 21203032199. The next prime is 21203032243. The reversal of 21203032231 is 13223030212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21203032231 - 2⁵ = 21203032199 is a prime.

It is a super-2 number, since 2×21203032231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203032199 and 21203032208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203030231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601516115 + 10601516116.

It is an arithmetic number, because the mean of its divisors is an integer number (10601516116).

Almost surely, 2^21203032231 is an apocalyptic number.

21203032231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203032231 is an equidigital number, since it uses as much as digits as its factorization.

21203032231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21203032231 its reverse (13223030212), we get a palindrome (34426062443).

The spelling of 21203032231 in words is "twenty-one billion, two hundred three million, thirty-two thousand, two hundred thirty-one".