221221200440 has 64 divisors (see below), whose sum is σ = 515770675200. Its totient is φ = 85336497792.

The previous prime is 221221200427. The next prime is 221221200509. The reversal of 221221200440 is 44002122122.

It is a super-2 number, since 2×221221200440² (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 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, 678152 + ... + 949911.

It is an arithmetic number, because the mean of its divisors is an integer number (8058916800).

Almost surely, 2^221221200440 is an apocalyptic number.

221221200440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221200440 is an abundant number, since it is smaller than the sum of its proper divisors (294549474760).

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

221221200440 is a wasteful number, since it uses less digits than its factorization.

221221200440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628196 (or 1628192 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 221221200440 its reverse (44002122122), we get a palindrome (265223322562).

The spelling of 221221200440 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, four hundred forty".