21132583709 has 2 divisors, whose sum is σ = 21132583710. Its totient is φ = 21132583708.

The previous prime is 21132583691. The next prime is 21132583741. The reversal of 21132583709 is 90738523112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21118483684 + 14100025 = 145322^2 + 3755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21132583709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21132583789) 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, 10566291854 + 10566291855.

It is an arithmetic number, because the mean of its divisors is an integer number (10566291855).

Almost surely, 2^21132583709 is an apocalyptic number.

It is an amenable number.

21132583709 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132583709 is an equidigital number, since it uses as much as digits as its factorization.

21132583709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 21132583709 in words is "twenty-one billion, one hundred thirty-two million, five hundred eighty-three thousand, seven hundred nine".