21847666674829 has 2 divisors, whose sum is σ = 21847666674830. Its totient is φ = 21847666674828.

The previous prime is 21847666674707. The next prime is 21847666674833. The reversal of 21847666674829 is 92847666674812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15608212222729 + 6239454452100 = 3950723^2 + 2497890^2 .

It is a cyclic number.

It is not a de Polignac number, because 21847666674829 - 2¹¹ = 21847666672781 is a prime.

It is a super-3 number, since 3×21847666674829³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21847666674839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923833337414 + 10923833337415.

It is an arithmetic number, because the mean of its divisors is an integer number (10923833337415).

Almost surely, 2^{21847666674829} is an apocalyptic number.

It is an amenable number.

21847666674829 is a deficient number, since it is larger than the sum of its proper divisors (1).

21847666674829 is an equidigital number, since it uses as much as digits as its factorization.

21847666674829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2341011456, while the sum is 76.

The spelling of 21847666674829 in words is "twenty-one trillion, eight hundred forty-seven billion, six hundred sixty-six million, six hundred seventy-four thousand, eight hundred twenty-nine".