16821270801 has 24 divisors (see below), whose sum is σ = 24461299200. Its totient is φ = 11138726016.

The previous prime is 16821270773. The next prime is 16821270803. The reversal of 16821270801 is 10807212861.

It is not a de Polignac number, because 16821270801 - 2⁵ = 16821270769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16821270803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1079401 + ... + 1094873.

It is an arithmetic number, because the mean of its divisors is an integer number (1019220800).

Almost surely, 2^16821270801 is an apocalyptic number.

It is an amenable number.

16821270801 is a deficient number, since it is larger than the sum of its proper divisors (7640028399).

16821270801 is a wasteful number, since it uses less digits than its factorization.

16821270801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16285 (or 16282 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 16821270801 in words is "sixteen billion, eight hundred twenty-one million, two hundred seventy thousand, eight hundred one".