7933918221 has 16 divisors (see below), whose sum is σ = 11797336320. Its totient is φ = 5269756320.

The previous prime is 7933918211. The next prime is 7933918243. The reversal of 7933918221 is 1228193397.

It is not a de Polignac number, because 7933918221 - 2⁹ = 7933917709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7933918211) 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 15 ways as a sum of consecutive naturals, for example, 534840 + ... + 549473.

It is an arithmetic number, because the mean of its divisors is an integer number (737333520).

Almost surely, 2^7933918221 is an apocalyptic number.

It is an amenable number.

7933918221 is a deficient number, since it is larger than the sum of its proper divisors (3863418099).

7933918221 is a wasteful number, since it uses less digits than its factorization.

7933918221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084593 (or 1084587 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 7933918221 is about 89072.5447093547. The cubic root of 7933918221 is about 1994.4779526116.

The spelling of 7933918221 in words is "seven billion, nine hundred thirty-three million, nine hundred eighteen thousand, two hundred twenty-one".