6421207 has 4 divisors (see below), whose sum is σ = 6915160. Its totient is φ = 5927256.

The previous prime is 6421201. The next prime is 6421211. The reversal of 6421207 is 7021246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7021246 = 2 ⋅3510623.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6421207 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 (6421201) 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, 246957 + ... + 246982.

It is an arithmetic number, because the mean of its divisors is an integer number (1728790).

Almost surely, 2^6421207 is an apocalyptic number.

6421207 is a deficient number, since it is larger than the sum of its proper divisors (493953).

6421207 is a wasteful number, since it uses less digits than its factorization.

6421207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493952.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 6421207 is about 2534.0100631213. The cubic root of 6421207 is about 185.8683984497.

It can be divided in two parts, 642 and 1207, that added together give a square (1849 = 43²).

The spelling of 6421207 in words is "six million, four hundred twenty-one thousand, two hundred seven".