16700042607721 has 16 divisors (see below), whose sum is σ = 19301530599360. Its totient is φ = 14280182945280.

The previous prime is 16700042607719. The next prime is 16700042607733. The reversal of 16700042607721 is 12770624000761.

It is a cyclic number.

It is not a de Polignac number, because 16700042607721 - 2¹ = 16700042607719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16700042607121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26637951 + ... + 27257668.

It is an arithmetic number, because the mean of its divisors is an integer number (1206345662460).

Almost surely, 2^{16700042607721} is an apocalyptic number.

16700042607721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16700042607721 is a deficient number, since it is larger than the sum of its proper divisors (2601487991639).

16700042607721 is a wasteful number, since it uses less digits than its factorization.

16700042607721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53897304.

The product of its (nonzero) digits is 197568, while the sum is 43.

The spelling of 16700042607721 in words is "sixteen trillion, seven hundred billion, forty-two million, six hundred seven thousand, seven hundred twenty-one".