220221232440 has 64 divisors (see below), whose sum is σ = 720724037760. Its totient is φ = 53386965120.

The previous prime is 220221232373. The next prime is 220221232459. The reversal of 220221232440 is 44232122022.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 220221232440.

It is a congruent number.

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, 83415814 + ... + 83418453.

It is an arithmetic number, because the mean of its divisors is an integer number (11261313090).

Almost surely, 2^220221232440 is an apocalyptic number.

220221232440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220221232440 is an abundant number, since it is smaller than the sum of its proper divisors (500502805320).

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

220221232440 is a wasteful number, since it uses less digits than its factorization.

220221232440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166834292 (or 166834288 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 220221232440 its reverse (44232122022), we get a palindrome (264453354462).

The spelling of 220221232440 in words is "two hundred twenty billion, two hundred twenty-one million, two hundred thirty-two thousand, four hundred forty".