6921225 has 36 divisors (see below), whose sum is σ = 13057200. Its totient is φ = 3494880.

The previous prime is 6921223. The next prime is 6921247. The reversal of 6921225 is 5221296.

It is not a de Polignac number, because 6921225 - 2¹ = 6921223 is a prime.

6921225 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6921221) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3466 + ... + 5084.

It is an arithmetic number, because the mean of its divisors is an integer number (362700).

Almost surely, 2^6921225 is an apocalyptic number.

It is an amenable number.

6921225 is a deficient number, since it is larger than the sum of its proper divisors (6135975).

6921225 is a wasteful number, since it uses less digits than its factorization.

6921225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1646 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 6921225 is about 2630.8221148531. The cubic root of 6921225 is about 190.5728326299.

The spelling of 6921225 in words is "six million, nine hundred twenty-one thousand, two hundred twenty-five".