6750421 has 4 divisors (see below), whose sum is σ = 6776352. Its totient is φ = 6724492.

The previous prime is 6750413. The next prime is 6750437. The reversal of 6750421 is 1240576.

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 6750421 - 2³ = 6750413 is a prime.

It is a Duffinian number.

6750421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6750461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12571 + ... + 13096.

It is an arithmetic number, because the mean of its divisors is an integer number (1694088).

Almost surely, 2^6750421 is an apocalyptic number.

It is an amenable number.

6750421 is a deficient number, since it is larger than the sum of its proper divisors (25931).

6750421 is a wasteful number, since it uses less digits than its factorization.

6750421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25930.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 6750421 is about 2598.1572315778. The cubic root of 6750421 is about 188.9920864897.

Adding to 6750421 its reverse (1240576), we get a palindrome (7990997).

The spelling of 6750421 in words is "six million, seven hundred fifty thousand, four hundred twenty-one".