21010507373287 has 2 divisors, whose sum is σ = 21010507373288. Its totient is φ = 21010507373286.

The previous prime is 21010507373269. The next prime is 21010507373291. The reversal of 21010507373287 is 78237370501012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21010507373287 - 2⁴³ = 12214414351079 is a prime.

It is a super-2 number, since 2×21010507373287² (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 (21010507373267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505253686643 + 10505253686644.

It is an arithmetic number, because the mean of its divisors is an integer number (10505253686644).

Almost surely, 2^{21010507373287} is an apocalyptic number.

21010507373287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010507373287 is an equidigital number, since it uses as much as digits as its factorization.

21010507373287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493920, while the sum is 46.

Adding to 21010507373287 its reverse (78237370501012), we get a palindrome (99247877874299).

The spelling of 21010507373287 in words is "twenty-one trillion, ten billion, five hundred seven million, three hundred seventy-three thousand, two hundred eighty-seven".