21115167740647 has 8 divisors (see below), whose sum is σ = 21252698157600. Its totient is φ = 20978074623264.

The previous prime is 21115167740627. The next prime is 21115167740669. The reversal of 21115167740647 is 74604776151112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21115167740647 - 2¹⁹ = 21115167216359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21115167740594 and 21115167740603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115167740627) 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 in 7 ways as a sum of consecutive naturals, for example, 109228008 + ... + 109421149.

It is an arithmetic number, because the mean of its divisors is an integer number (2656587269700).

Almost surely, 2^{21115167740647} is an apocalyptic number.

21115167740647 is a deficient number, since it is larger than the sum of its proper divisors (137530416953).

21115167740647 is a wasteful number, since it uses less digits than its factorization.

21115167740647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218649785.

The product of its (nonzero) digits is 1975680, while the sum is 52.

The spelling of 21115167740647 in words is "twenty-one trillion, one hundred fifteen billion, one hundred sixty-seven million, seven hundred forty thousand, six hundred forty-seven".