21610515975743 has 2 divisors, whose sum is σ = 21610515975744. Its totient is φ = 21610515975742.

The previous prime is 21610515975661. The next prime is 21610515975767. The reversal of 21610515975743 is 34757951501612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21610515975743 - 2¹⁸ = 21610515713599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21610515975773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805257987871 + 10805257987872.

It is an arithmetic number, because the mean of its divisors is an integer number (10805257987872).

Almost surely, 2^{21610515975743} is an apocalyptic number.

21610515975743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610515975743 is an equidigital number, since it uses as much as digits as its factorization.

21610515975743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938000, while the sum is 56.

The spelling of 21610515975743 in words is "twenty-one trillion, six hundred ten billion, five hundred fifteen million, nine hundred seventy-five thousand, seven hundred forty-three".