21303410537 has 2 divisors, whose sum is σ = 21303410538. Its totient is φ = 21303410536.

The previous prime is 21303410503. The next prime is 21303410599. The reversal of 21303410537 is 73501430312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12857065321 + 8446345216 = 113389^2 + 91904^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303410537 - 2¹² = 21303406441 is a prime.

It is not a weakly prime, because it can be changed into another prime (21303010537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651705268 + 10651705269.

It is an arithmetic number, because the mean of its divisors is an integer number (10651705269).

Almost surely, 2^21303410537 is an apocalyptic number.

It is an amenable number.

21303410537 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303410537 is an equidigital number, since it uses as much as digits as its factorization.

21303410537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 29.

Adding to 21303410537 its reverse (73501430312), we get a palindrome (94804840849).

The spelling of 21303410537 in words is "twenty-one billion, three hundred three million, four hundred ten thousand, five hundred thirty-seven".