221210303242440 has 128 divisors (see below), whose sum is σ = 665667244293120. Its totient is φ = 58808423520000.

The previous prime is 221210303242429. The next prime is 221210303242633. The reversal of 221210303242440 is 44242303012122.

It is a super-2 number, since 2×221210303242440² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 221210303242398 and 221210303242407.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 923409957 + ... + 923649483.

It is an arithmetic number, because the mean of its divisors is an integer number (5200525346040).

Almost surely, 2^{221210303242440} is an apocalyptic number.

221210303242440 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 221210303242440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332833622146560).

221210303242440 is an abundant number, since it is smaller than the sum of its proper divisors (444456941050680).

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

221210303242440 is a wasteful number, since it uses less digits than its factorization.

221210303242440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263123 (or 263119 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 221210303242440 its reverse (44242303012122), we get a palindrome (265452606254562).

The spelling of 221210303242440 in words is "two hundred twenty-one trillion, two hundred ten billion, three hundred three million, two hundred forty-two thousand, four hundred forty".