21373686547 has 2 divisors, whose sum is σ = 21373686548. Its totient is φ = 21373686546.

The previous prime is 21373686541. The next prime is 21373686619. The reversal of 21373686547 is 74568637312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21373686547 - 2¹¹ = 21373684499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21373686494 and 21373686503.

It is not a weakly prime, because it can be changed into another prime (21373686541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10686843273 + 10686843274.

It is an arithmetic number, because the mean of its divisors is an integer number (10686843274).

Almost surely, 2^21373686547 is an apocalyptic number.

21373686547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21373686547 is an equidigital number, since it uses as much as digits as its factorization.

21373686547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 52.

The spelling of 21373686547 in words is "twenty-one billion, three hundred seventy-three million, six hundred eighty-six thousand, five hundred forty-seven".