21436000973 has 2 divisors, whose sum is σ = 21436000974. Its totient is φ = 21436000972.

The previous prime is 21436000903. The next prime is 21436001003. The reversal of 21436000973 is 37900063412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11990688004 + 9445312969 = 109502^2 + 97187^2 .

It is a cyclic number.

It is not a de Polignac number, because 21436000973 - 2¹² = 21435996877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21436000903) 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, 10718000486 + 10718000487.

It is an arithmetic number, because the mean of its divisors is an integer number (10718000487).

Almost surely, 2^21436000973 is an apocalyptic number.

It is an amenable number.

21436000973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21436000973 is an equidigital number, since it uses as much as digits as its factorization.

21436000973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The spelling of 21436000973 in words is "twenty-one billion, four hundred thirty-six million, nine hundred seventy-three", and thus it is an aban number.