21187303297 has 2 divisors, whose sum is σ = 21187303298. Its totient is φ = 21187303296.

The previous prime is 21187303283. The next prime is 21187303309. The reversal of 21187303297 is 79230378112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10840141456 + 10347161841 = 104116^2 + 101721^2 .

It is a cyclic number.

It is not a de Polignac number, because 21187303297 - 2¹⁵ = 21187270529 is a prime.

It is not a weakly prime, because it can be changed into another prime (21187303597) 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, 10593651648 + 10593651649.

It is an arithmetic number, because the mean of its divisors is an integer number (10593651649).

Almost surely, 2^21187303297 is an apocalyptic number.

It is an amenable number.

21187303297 is a deficient number, since it is larger than the sum of its proper divisors (1).

21187303297 is an equidigital number, since it uses as much as digits as its factorization.

21187303297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The spelling of 21187303297 in words is "twenty-one billion, one hundred eighty-seven million, three hundred three thousand, two hundred ninety-seven".