16721840667400 has 48 divisors (see below), whose sum is σ = 42412668607440. Its totient is φ = 6080669332800.

The previous prime is 16721840667379. The next prime is 16721840667409. The reversal of 16721840667400 is 476604812761.

It is not an unprimeable number, because it can be changed into a prime (16721840667409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3800416134 + ... + 3800420533.

It is an arithmetic number, because the mean of its divisors is an integer number (883597262655).

Almost surely, 2^{16721840667400} is an apocalyptic number.

16721840667400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16721840667400 is an abundant number, since it is smaller than the sum of its proper divisors (25690827940040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16721840667400 is a wasteful number, since it uses less digits than its factorization.

16721840667400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7600836694 (or 7600836685 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 16721840667400 in words is "sixteen trillion, seven hundred twenty-one billion, eight hundred forty million, six hundred sixty-seven thousand, four hundred".