21866674117 has 2 divisors, whose sum is σ = 21866674118. Its totient is φ = 21866674116.

The previous prime is 21866674003. The next prime is 21866674129. The reversal of 21866674117 is 71147666812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21738848481 + 127825636 = 147441^2 + 11306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21866674117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21866671117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10933337058 + 10933337059.

It is an arithmetic number, because the mean of its divisors is an integer number (10933337059).

Almost surely, 2^21866674117 is an apocalyptic number.

It is an amenable number.

21866674117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21866674117 is an equidigital number, since it uses as much as digits as its factorization.

21866674117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The spelling of 21866674117 in words is "twenty-one billion, eight hundred sixty-six million, six hundred seventy-four thousand, one hundred seventeen".