21787032514783 has 2 divisors, whose sum is σ = 21787032514784. Its totient is φ = 21787032514782.

The previous prime is 21787032514757. The next prime is 21787032514817. The reversal of 21787032514783 is 38741523078712.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21787032514783 is a prime.

It is a super-2 number, since 2×21787032514783² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21787032514703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10893516257391 + 10893516257392.

It is an arithmetic number, because the mean of its divisors is an integer number (10893516257392).

Almost surely, 2^{21787032514783} is an apocalyptic number.

21787032514783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21787032514783 is an equidigital number, since it uses as much as digits as its factorization.

21787032514783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15805440, while the sum is 58.

The spelling of 21787032514783 in words is "twenty-one trillion, seven hundred eighty-seven billion, thirty-two million, five hundred fourteen thousand, seven hundred eighty-three".