16721701001 has 2 divisors, whose sum is σ = 16721701002. Its totient is φ = 16721701000.

The previous prime is 16721700959. The next prime is 16721701021. The reversal of 16721701001 is 10010712761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16563947401 + 157753600 = 128701^2 + 12560^2 .

It is a cyclic number.

It is not a de Polignac number, because 16721701001 - 2²⁶ = 16654592137 is a prime.

It is not a weakly prime, because it can be changed into another prime (16721701021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360850500 + 8360850501.

It is an arithmetic number, because the mean of its divisors is an integer number (8360850501).

Almost surely, 2^16721701001 is an apocalyptic number.

It is an amenable number.

16721701001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721701001 is an equidigital number, since it uses as much as digits as its factorization.

16721701001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 26.

The spelling of 16721701001 in words is "sixteen billion, seven hundred twenty-one million, seven hundred one thousand, one".