16821667147 has 4 divisors (see below), whose sum is σ = 16823014696. Its totient is φ = 16820319600.

The previous prime is 16821667141. The next prime is 16821667183. The reversal of 16821667147 is 74176612861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16821667147 - 2³ = 16821667139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16821667147.

It is not an unprimeable number, because it can be changed into a prime (16821667141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654873 + ... + 680074.

It is an arithmetic number, because the mean of its divisors is an integer number (4205753674).

Almost surely, 2^16821667147 is an apocalyptic number.

16821667147 is a deficient number, since it is larger than the sum of its proper divisors (1347549).

16821667147 is a wasteful number, since it uses less digits than its factorization.

16821667147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347548.

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

The spelling of 16821667147 in words is "sixteen billion, eight hundred twenty-one million, six hundred sixty-seven thousand, one hundred forty-seven".