21865424600693 has 2 divisors, whose sum is σ = 21865424600694. Its totient is φ = 21865424600692.

The previous prime is 21865424600629. The next prime is 21865424600711. The reversal of 21865424600693 is 39600642456812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17921319956164 + 3944104644529 = 4233358^2 + 1985977^2 .

It is a cyclic number.

It is not a de Polignac number, because 21865424600693 - 2⁶ = 21865424600629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21865424600603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10932712300346 + 10932712300347.

It is an arithmetic number, because the mean of its divisors is an integer number (10932712300347).

Almost surely, 2^{21865424600693} is an apocalyptic number.

It is an amenable number.

21865424600693 is a deficient number, since it is larger than the sum of its proper divisors (1).

21865424600693 is an equidigital number, since it uses as much as digits as its factorization.

21865424600693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 21865424600693 in words is "twenty-one trillion, eight hundred sixty-five billion, four hundred twenty-four million, six hundred thousand, six hundred ninety-three".