221222620 has 24 divisors (see below), whose sum is σ = 464864400. Its totient is φ = 88432512.

The previous prime is 221222611. The next prime is 221222627. The reversal of 221222620 is 26222122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44416 + ... + 49144.

It is an arithmetic number, because the mean of its divisors is an integer number (19369350).

Almost surely, 2^221222620 is an apocalyptic number.

221222620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222620 is an abundant number, since it is smaller than the sum of its proper divisors (243641780).

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

221222620 is a wasteful number, since it uses less digits than its factorization.

221222620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7077 (or 7075 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221222620 is about 14873.5543835359. The cubic root of 221222620 is about 604.7973002163.

Adding to 221222620 its reverse (26222122), we get a palindrome (247444742).

It can be divided in two parts, 22122 and 2620, that added together give a palindrome (24742).

The spelling of 221222620 in words is "two hundred twenty-one million, two hundred twenty-two thousand, six hundred twenty".