21303203135737 has 2 divisors, whose sum is σ = 21303203135738. Its totient is φ = 21303203135736.

The previous prime is 21303203135663. The next prime is 21303203135779. The reversal of 21303203135737 is 73753130230312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16259693293561 + 5043509842176 = 4032331^2 + 2245776^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303203135737 - 2³¹ = 21301055652089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21303203135737.

It is not a weakly prime, because it can be changed into another prime (21303203135537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651601567868 + 10651601567869.

It is an arithmetic number, because the mean of its divisors is an integer number (10651601567869).

Almost surely, 2^{21303203135737} is an apocalyptic number.

It is an amenable number.

21303203135737 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303203135737 is an equidigital number, since it uses as much as digits as its factorization.

21303203135737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 40.

The spelling of 21303203135737 in words is "twenty-one trillion, three hundred three billion, two hundred three million, one hundred thirty-five thousand, seven hundred thirty-seven".