7327172921 has 2 divisors, whose sum is σ = 7327172922. Its totient is φ = 7327172920.

The previous prime is 7327172917. The next prime is 7327172971. The reversal of 7327172921 is 1292717237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7151239225 + 175933696 = 84565^2 + 13264^2 .

It is a cyclic number.

It is not a de Polignac number, because 7327172921 - 2² = 7327172917 is a prime.

It is not a weakly prime, because it can be changed into another prime (7327172911) 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 as a sum of consecutive naturals, namely, 3663586460 + 3663586461.

It is an arithmetic number, because the mean of its divisors is an integer number (3663586461).

Almost surely, 2^7327172921 is an apocalyptic number.

It is an amenable number.

7327172921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7327172921 is an equidigital number, since it uses as much as digits as its factorization.

7327172921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 7327172921 is about 85598.9072418568. The cubic root of 7327172921 is about 1942.2813811044.

The spelling of 7327172921 in words is "seven billion, three hundred twenty-seven million, one hundred seventy-two thousand, nine hundred twenty-one".