6621012 has 18 divisors (see below), whose sum is σ = 16736538. Its totient is φ = 2206992.

The previous prime is 6620981. The next prime is 6621029. The reversal of 6621012 is 2101266.

It is a happy number.

6621012 is a `hidden beast` number, since 662 + 1 + 0 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4016016 + 2604996 = 2004^2 + 1614^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91923 + ... + 91994.

Almost surely, 2^6621012 is an apocalyptic number.

It is an amenable number.

6621012 is an abundant number, since it is smaller than the sum of its proper divisors (10115526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6621012 is a wasteful number, since it uses less digits than its factorization.

6621012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183927 (or 183922 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 6621012 is about 2573.1327210232. The cubic root of 6621012 is about 187.7765944421.

Adding to 6621012 its reverse (2101266), we get a palindrome (8722278).

The spelling of 6621012 in words is "six million, six hundred twenty-one thousand, twelve".