9218273921 has 2 divisors, whose sum is σ = 9218273922. Its totient is φ = 9218273920.

The previous prime is 9218273917. The next prime is 9218273969. The reversal of 9218273921 is 1293728129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6742216321 + 2476057600 = 82111^2 + 49760^2 .

It is a cyclic number.

It is not a de Polignac number, because 9218273921 - 2² = 9218273917 is a prime.

It is not a weakly prime, because it can be changed into another prime (9218273971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4609136960 + 4609136961.

It is an arithmetic number, because the mean of its divisors is an integer number (4609136961).

Almost surely, 2^9218273921 is an apocalyptic number.

It is an amenable number.

9218273921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9218273921 is an equidigital number, since it uses as much as digits as its factorization.

9218273921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 9218273921 is about 96011.8426080866. The cubic root of 9218273921 is about 2096.7655363402.

The spelling of 9218273921 in words is "nine billion, two hundred eighteen million, two hundred seventy-three thousand, nine hundred twenty-one".