6601421 has 4 divisors (see below), whose sum is σ = 6623232. Its totient is φ = 6579612.

The previous prime is 6601411. The next prime is 6601433. The reversal of 6601421 is 1241066.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 6601421 - 2²² = 2407117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6601393 and 6601402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10445 + ... + 11058.

It is an arithmetic number, because the mean of its divisors is an integer number (1655808).

Almost surely, 2^6601421 is an apocalyptic number.

It is an amenable number.

6601421 is a deficient number, since it is larger than the sum of its proper divisors (21811).

6601421 is a wasteful number, since it uses less digits than its factorization.

6601421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21810.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 6601421 is about 2569.3230625984. The cubic root of 6601421 is about 187.5912065897.

Adding to 6601421 its reverse (1241066), we get a palindrome (7842487).

The spelling of 6601421 in words is "six million, six hundred one thousand, four hundred twenty-one".