72016700021 has 4 divisors (see below), whose sum is σ = 82304800032. Its totient is φ = 61728600012.

The previous prime is 72016700009. The next prime is 72016700053. The reversal of 72016700021 is 12000761027.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12000761027 = 47 ⋅255335341.

It is a cyclic number.

It is not a de Polignac number, because 72016700021 - 2¹⁰ = 72016698997 is a prime.

It is a super-3 number, since 3×72016700021³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72016700321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5144049995 + ... + 5144050008.

It is an arithmetic number, because the mean of its divisors is an integer number (20576200008).

Almost surely, 2^72016700021 is an apocalyptic number.

It is an amenable number.

72016700021 is a deficient number, since it is larger than the sum of its proper divisors (10288100011).

72016700021 is a wasteful number, since it uses less digits than its factorization.

72016700021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288100010.

The product of its (nonzero) digits is 1176, while the sum is 26.

The spelling of 72016700021 in words is "seventy-two billion, sixteen million, seven hundred thousand, twenty-one".