6421212 has 72 divisors (see below), whose sum is σ = 18834816. Its totient is φ = 1806624.

The previous prime is 6421211. The next prime is 6421231. The reversal of 6421212 is 2121246.

6421212 is a `hidden beast` number, since 642 + 1 + 21 + 2 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20763 + ... + 21069.

Almost surely, 2^6421212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6421212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9417408).

6421212 is an abundant number, since it is smaller than the sum of its proper divisors (12413604).

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

6421212 is a wasteful number, since it uses less digits than its factorization.

6421212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 402 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 6421212 is about 2534.0110496997. The cubic root of 6421212 is about 185.8684466930.

Adding to 6421212 its reverse (2121246), we get a palindrome (8542458).

The spelling of 6421212 in words is "six million, four hundred twenty-one thousand, two hundred twelve".