21103240337 has 2 divisors, whose sum is σ = 21103240338. Its totient is φ = 21103240336.

The previous prime is 21103240271. The next prime is 21103240349. The reversal of 21103240337 is 73304230112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20736288001 + 366952336 = 144001^2 + 19156^2 .

It is a cyclic number.

It is not a de Polignac number, because 21103240337 - 2²⁴ = 21086463121 is a prime.

It is not a weakly prime, because it can be changed into another prime (21103240357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551620168 + 10551620169.

It is an arithmetic number, because the mean of its divisors is an integer number (10551620169).

Almost surely, 2^21103240337 is an apocalyptic number.

It is an amenable number.

21103240337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21103240337 is an equidigital number, since it uses as much as digits as its factorization.

21103240337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 26.

Adding to 21103240337 its reverse (73304230112), we get a palindrome (94407470449).

The spelling of 21103240337 in words is "twenty-one billion, one hundred three million, two hundred forty thousand, three hundred thirty-seven".