16821755380007 has 8 divisors (see below), whose sum is σ = 17083068116736. Its totient is φ = 16560743871672.

The previous prime is 16821755379959. The next prime is 16821755380037. The reversal of 16821755380007 is 70008355712861.

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 16821755380007 - 2⁶ = 16821755379943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821755380037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75194543 + ... + 75417920.

It is an arithmetic number, because the mean of its divisors is an integer number (2135383514592).

Almost surely, 2^{16821755380007} is an apocalyptic number.

16821755380007 is a deficient number, since it is larger than the sum of its proper divisors (261312736729).

16821755380007 is a wasteful number, since it uses less digits than its factorization.

16821755380007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150614197.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The spelling of 16821755380007 in words is "sixteen trillion, eight hundred twenty-one billion, seven hundred fifty-five million, three hundred eighty thousand, seven".