621212 has 6 divisors (see below), whose sum is σ = 1087128. Its totient is φ = 310604.

The previous prime is 621143. The next prime is 621217. The reversal of 621212 is 212126.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621212.

It is not an unprimeable number, because it can be changed into a prime (621217) by changing a digit.

621212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77648 + ... + 77655.

It is an arithmetic number, because the mean of its divisors is an integer number (181188).

2⁶²¹²¹² is an apocalyptic number.

It is an amenable number.

621212 is a deficient number, since it is larger than the sum of its proper divisors (465916).

621212 is a wasteful number, since it uses less digits than its factorization.

621212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155307 (or 155305 counting only the distinct ones).

The product of its digits is 48, while the sum is 14.

The square root of 621212 is about 788.1700324169. The cubic root of 621212 is about 85.3257168224.

Multiplying 621212 by its sum of digits (14), we get a palindrome (8696968).

Adding to 621212 its reverse (212126), we get a palindrome (833338).

The spelling of 621212 in words is "six hundred twenty-one thousand, two hundred twelve".