72021021107017 has 4 divisors (see below), whose sum is σ = 72043762196736. Its totient is φ = 71998280017300.

The previous prime is 72021021106987. The next prime is 72021021107027. The reversal of 72021021107017 is 71070112012027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72021021107017 - 2²³ = 72021012718409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72021021107017.

It is not an unprimeable number, because it can be changed into a prime (72021021107027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11370540109 + ... + 11370546442.

It is an arithmetic number, because the mean of its divisors is an integer number (18010940549184).

Almost surely, 2^{72021021107017} is an apocalyptic number.

It is an amenable number.

72021021107017 is a deficient number, since it is larger than the sum of its proper divisors (22741089719).

72021021107017 is a wasteful number, since it uses less digits than its factorization.

72021021107017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22741089718.

The product of its (nonzero) digits is 2744, while the sum is 31.

The spelling of 72021021107017 in words is "seventy-two trillion, twenty-one billion, twenty-one million, one hundred seven thousand, seventeen".