222021040 has 80 divisors (see below), whose sum is σ = 532385568. Its totient is φ = 86059008.

The previous prime is 222021017. The next prime is 222021067. The reversal of 222021040 is 40120222.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 222021040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801382 + ... + 801658.

Almost surely, 2^222021040 is an apocalyptic number.

222021040 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 222021040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266192784).

222021040 is an abundant number, since it is smaller than the sum of its proper divisors (310364528).

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

222021040 is a wasteful number, since it uses less digits than its factorization.

222021040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 222021040 is about 14900.3704651931. The cubic root of 222021040 is about 605.5240229102.

Adding to 222021040 its reverse (40120222), we get a palindrome (262141262).

The spelling of 222021040 in words is "two hundred twenty-two million, twenty-one thousand, forty".