7894288221 has 16 divisors (see below), whose sum is σ = 10833711360. Its totient is φ = 5111046720.

The previous prime is 7894288201. The next prime is 7894288231. The reversal of 7894288221 is 1228824987.

It is not a de Polignac number, because 7894288221 - 2⁵ = 7894288189 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 (7894288201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258570 + ... + 287483.

It is an arithmetic number, because the mean of its divisors is an integer number (677106960).

Almost surely, 2^7894288221 is an apocalyptic number.

It is an amenable number.

7894288221 is a deficient number, since it is larger than the sum of its proper divisors (2939423139).

7894288221 is a wasteful number, since it uses less digits than its factorization.

7894288221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546196.

The product of its digits is 1032192, while the sum is 51.

The square root of 7894288221 is about 88849.8070960202. The cubic root of 7894288221 is about 1991.1515956855.

The spelling of 7894288221 in words is "seven billion, eight hundred ninety-four million, two hundred eighty-eight thousand, two hundred twenty-one".