21609740143 has 2 divisors, whose sum is σ = 21609740144. Its totient is φ = 21609740142.

The previous prime is 21609740099. The next prime is 21609740167. The reversal of 21609740143 is 34104790612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21609740143 - 2¹⁷ = 21609609071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21609240143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10804870071 + 10804870072.

It is an arithmetic number, because the mean of its divisors is an integer number (10804870072).

Almost surely, 2^21609740143 is an apocalyptic number.

21609740143 is a deficient number, since it is larger than the sum of its proper divisors (1).

21609740143 is an equidigital number, since it uses as much as digits as its factorization.

21609740143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 21609740143 in words is "twenty-one billion, six hundred nine million, seven hundred forty thousand, one hundred forty-three".