621222 has 24 divisors (see below), whose sum is σ = 1445976. Its totient is φ = 177408.

The previous prime is 621217. The next prime is 621223. The reversal of 621222 is 222126.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621223) by changing a digit.

621222 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 in 11 ways as a sum of consecutive naturals, for example, 763 + ... + 1350.

It is an arithmetic number, because the mean of its divisors is an integer number (60249).

2⁶²¹²²² is an apocalyptic number.

621222 is an abundant number, since it is smaller than the sum of its proper divisors (824754).

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

621222 is a wasteful number, since it uses less digits than its factorization.

621222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132 (or 2125 counting only the distinct ones).

The product of its digits is 96, while the sum is 15.

The square root of 621222 is about 788.1763762001. The cubic root of 621222 is about 85.3261746653.

Subtracting from 621222 its product of digits (96), we obtain a palindrome (621126).

Adding to 621222 its reverse (222126), we get a palindrome (843348).

The spelling of 621222 in words is "six hundred twenty-one thousand, two hundred twenty-two".