221210310440 has 32 divisors (see below), whose sum is σ = 568826513280. Its totient is φ = 75843534912.

The previous prime is 221210310437. The next prime is 221210310457. The reversal of 221210310440 is 44013012122.

It is a super-2 number, since 2×221210310440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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, 395018132 + ... + 395018691.

It is an arithmetic number, because the mean of its divisors is an integer number (17775828540).

Almost surely, 2^221210310440 is an apocalyptic number.

221210310440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210310440 is an abundant number, since it is smaller than the sum of its proper divisors (347616202840).

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

221210310440 is a wasteful number, since it uses less digits than its factorization.

221210310440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790036841 (or 790036837 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221210310440 its reverse (44013012122), we get a palindrome (265223322562).

The spelling of 221210310440 in words is "two hundred twenty-one billion, two hundred ten million, three hundred ten thousand, four hundred forty".