6421121 has 8 divisors (see below), whose sum is σ = 7770240. Its totient is φ = 5179968.

The previous prime is 6421111. The next prime is 6421127. The reversal of 6421121 is 1211246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6421121 - 2²² = 2226817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6421121.

It is not an unprimeable number, because it can be changed into a prime (6421127) 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 7 ways as a sum of consecutive naturals, for example, 26861 + ... + 27098.

It is an arithmetic number, because the mean of its divisors is an integer number (971280).

Almost surely, 2^6421121 is an apocalyptic number.

It is an amenable number.

6421121 is a deficient number, since it is larger than the sum of its proper divisors (1349119).

6421121 is a wasteful number, since it uses less digits than its factorization.

6421121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53983.

The product of its digits is 96, while the sum is 17.

The square root of 6421121 is about 2533.9930939132. The cubic root of 6421121 is about 185.8675686600.

Adding to 6421121 its reverse (1211246), we get a palindrome (7632367).

It can be divided in two parts, 64211 and 21, that multiplied together give a palindrome (1348431).

The spelling of 6421121 in words is "six million, four hundred twenty-one thousand, one hundred twenty-one".