9213167509721 has 6 divisors (see below), whose sum is σ = 10717358123610. Its totient is φ = 7897000722576.

The previous prime is 9213167509681. The next prime is 9213167509727. The reversal of 9213167509721 is 1279057613129.

It can be written as a sum of positive squares in only one way, i.e., 6086760042496 + 3126407467225 = 2467136^2 + 1768165^2 .

It is not a de Polignac number, because 9213167509721 - 2²² = 9213163315417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9213167509727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94011913316 + ... + 94011913413.

It is an arithmetic number, because the mean of its divisors is an integer number (1786226353935).

Almost surely, 2^{9213167509721} is an apocalyptic number.

It is an amenable number.

9213167509721 is a deficient number, since it is larger than the sum of its proper divisors (1504190613889).

9213167509721 is a wasteful number, since it uses less digits than its factorization.

9213167509721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188023826743 (or 188023826736 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 9213167509721 in words is "nine trillion, two hundred thirteen billion, one hundred sixty-seven million, five hundred nine thousand, seven hundred twenty-one".