222421500 has 288 divisors, whose sum is σ = 839494656. Its totient is φ = 48470400.

The previous prime is 222421483. The next prime is 222421513. The reversal of 222421500 is 5124222.

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 95 ways as a sum of consecutive naturals, for example, 724347 + ... + 724653.

It is an arithmetic number, because the mean of its divisors is an integer number (2914912).

Almost surely, 2^222421500 is an apocalyptic number.

222421500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222421500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419747328).

222421500 is an abundant number, since it is smaller than the sum of its proper divisors (617073156).

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

222421500 is a wasteful number, since it uses less digits than its factorization.

222421500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 222421500 is about 14913.8023320681. The cubic root of 222421500 is about 605.8878660606.

Adding to 222421500 its reverse (5124222), we get a palindrome (227545722).

The spelling of 222421500 in words is "two hundred twenty-two million, four hundred twenty-one thousand, five hundred".