21232450331 has 2 divisors, whose sum is σ = 21232450332. Its totient is φ = 21232450330.

The previous prime is 21232450303. The next prime is 21232450367. The reversal of 21232450331 is 13305423212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21232450331 - 2²⁶ = 21165341467 is a prime.

It is a super-2 number, since 2×21232450331² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21232450331.

It is not a weakly prime, because it can be changed into another prime (21232050331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616225165 + 10616225166.

It is an arithmetic number, because the mean of its divisors is an integer number (10616225166).

Almost surely, 2^21232450331 is an apocalyptic number.

21232450331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232450331 is an equidigital number, since it uses as much as digits as its factorization.

21232450331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21232450331 its reverse (13305423212), we get a palindrome (34537873543).

The spelling of 21232450331 in words is "twenty-one billion, two hundred thirty-two million, four hundred fifty thousand, three hundred thirty-one".