21232465357 has 2 divisors, whose sum is σ = 21232465358. Its totient is φ = 21232465356.

The previous prime is 21232465349. The next prime is 21232465427. The reversal of 21232465357 is 75356423212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20013477961 + 1218987396 = 141469^2 + 34914^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232465357 - 2³ = 21232465349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232465057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616232678 + 10616232679.

It is an arithmetic number, because the mean of its divisors is an integer number (10616232679).

Almost surely, 2^21232465357 is an apocalyptic number.

It is an amenable number.

21232465357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232465357 is an equidigital number, since it uses as much as digits as its factorization.

21232465357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 40.

Adding to 21232465357 its reverse (75356423212), we get a palindrome (96588888569).

The spelling of 21232465357 in words is "twenty-one billion, two hundred thirty-two million, four hundred sixty-five thousand, three hundred fifty-seven".