21676668547 has 2 divisors, whose sum is σ = 21676668548. Its totient is φ = 21676668546.

The previous prime is 21676668469. The next prime is 21676668569. The reversal of 21676668547 is 74586667612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21676668547 - 2¹⁵ = 21676635779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21676668491 and 21676668500.

It is not a weakly prime, because it can be changed into another prime (21676668577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838334273 + 10838334274.

It is an arithmetic number, because the mean of its divisors is an integer number (10838334274).

Almost surely, 2^21676668547 is an apocalyptic number.

21676668547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21676668547 is an equidigital number, since it uses as much as digits as its factorization.

21676668547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 58.

The spelling of 21676668547 in words is "twenty-one billion, six hundred seventy-six million, six hundred sixty-eight thousand, five hundred forty-seven".