7942221 has 12 divisors (see below), whose sum is σ = 13111072. Its totient is φ = 4538376.

The previous prime is 7942219. The next prime is 7942223. The reversal of 7942221 is 1222497.

It is an interprime number because it is at equal distance from previous prime (7942219) and next prime (7942223).

It is not a de Polignac number, because 7942221 - 2¹ = 7942219 is a prime.

It is a Duffinian number.

7942221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7942223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62971 + ... + 63096.

Almost surely, 2^7942221 is an apocalyptic number.

It is an amenable number.

7942221 is a deficient number, since it is larger than the sum of its proper divisors (5168851).

7942221 is a wasteful number, since it uses less digits than its factorization.

7942221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126080 (or 126077 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 7942221 is about 2818.1946348682. The cubic root of 7942221 is about 199.5173444886.

The spelling of 7942221 in words is "seven million, nine hundred forty-two thousand, two hundred twenty-one".