6622421 has 4 divisors (see below), whose sum is σ = 7131852. Its totient is φ = 6112992.

The previous prime is 6622391. The next prime is 6622423. The reversal of 6622421 is 1242266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1242266 = 2 ⋅621133.

It can be written as a sum of positive squares in 2 ways, for example, as 2464900 + 4157521 = 1570^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 6622421 - 2²² = 2428117 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6622423) 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, 254696 + ... + 254721.

It is an arithmetic number, because the mean of its divisors is an integer number (1782963).

Almost surely, 2^6622421 is an apocalyptic number.

It is an amenable number.

6622421 is a deficient number, since it is larger than the sum of its proper divisors (509431).

6622421 is a wasteful number, since it uses less digits than its factorization.

6622421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509430.

The product of its digits is 1152, while the sum is 23.

The square root of 6622421 is about 2573.4064972328. The cubic root of 6622421 is about 187.7899135770.

Adding to 6622421 its reverse (1242266), we get a palindrome (7864687).

The spelling of 6622421 in words is "six million, six hundred twenty-two thousand, four hundred twenty-one".