16721245701 has 24 divisors (see below), whose sum is σ = 24773485464. Its totient is φ = 10861770240.

The previous prime is 16721245693. The next prime is 16721245711. The reversal of 16721245701 is 10754212761.

16721245701 is a `hidden beast` number, since 1 + 6 + 72 + 12 + 4 + 570 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 57017601 + 16664228100 = 7551^2 + 129090^2 .

It is not a de Polignac number, because 16721245701 - 2³ = 16721245693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721245711) 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, 265665 + ... + 322521.

It is an arithmetic number, because the mean of its divisors is an integer number (1032228561).

Almost surely, 2^16721245701 is an apocalyptic number.

It is an amenable number.

16721245701 is a deficient number, since it is larger than the sum of its proper divisors (8052239763).

16721245701 is a wasteful number, since it uses less digits than its factorization.

16721245701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57701 (or 57698 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 16721245701 in words is "sixteen billion, seven hundred twenty-one million, two hundred forty-five thousand, seven hundred one".