7422821 has 4 divisors (see below), whose sum is σ = 8483232. Its totient is φ = 6362412.

The previous prime is 7422781. The next prime is 7422827. The reversal of 7422821 is 1282247.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7422821 - 2¹⁰ = 7421797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7422827) 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 3 ways as a sum of consecutive naturals, for example, 530195 + ... + 530208.

It is an arithmetic number, because the mean of its divisors is an integer number (2120808).

Almost surely, 2^7422821 is an apocalyptic number.

It is an amenable number.

7422821 is a deficient number, since it is larger than the sum of its proper divisors (1060411).

7422821 is a wasteful number, since it uses less digits than its factorization.

7422821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060410.

The product of its digits is 1792, while the sum is 26.

The square root of 7422821 is about 2724.4854560082. The cubic root of 7422821 is about 195.0696310611.

The spelling of 7422821 in words is "seven million, four hundred twenty-two thousand, eight hundred twenty-one".