921372711647 has 4 divisors (see below), whose sum is σ = 969866012280. Its totient is φ = 872879411016.

The previous prime is 921372711551. The next prime is 921372711659. The reversal of 921372711647 is 746117273129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746117273129 = 195709 ⋅3812381.

It is a cyclic number.

It is not a de Polignac number, because 921372711647 - 2²⁰ = 921371663071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 921372711595 and 921372711604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921372719647) 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, 24246650288 + ... + 24246650325.

It is an arithmetic number, because the mean of its divisors is an integer number (242466503070).

Almost surely, 2^921372711647 is an apocalyptic number.

921372711647 is a deficient number, since it is larger than the sum of its proper divisors (48493300633).

921372711647 is a wasteful number, since it uses less digits than its factorization.

921372711647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48493300632.

The product of its digits is 889056, while the sum is 50.

The spelling of 921372711647 in words is "nine hundred twenty-one billion, three hundred seventy-two million, seven hundred eleven thousand, six hundred forty-seven".