221231402243100 has 216 divisors, whose sum is σ = 699676740322560. Its totient is φ = 58465452240000.

The previous prime is 221231402243053. The next prime is 221231402243119. The reversal of 221231402243100 is 1342204132122.

221231402243100 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 3 + 1 + 402 + 243 + 10 + 0 = 666.

It is a super-2 number, since 2×221231402243100² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 85858525 + ... + 88397675.

It is an arithmetic number, because the mean of its divisors is an integer number (3239244168160).

Almost surely, 2^{221231402243100} is an apocalyptic number.

221231402243100 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 221231402243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (349838370161280).

221231402243100 is an abundant number, since it is smaller than the sum of its proper divisors (478445338079460).

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

221231402243100 is a wasteful number, since it uses less digits than its factorization.

221231402243100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540041 (or 2540031 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 221231402243100 its reverse (1342204132122), we get a palindrome (222573606375222).

The spelling of 221231402243100 in words is "two hundred twenty-one trillion, two hundred thirty-one billion, four hundred two million, two hundred forty-three thousand, one hundred".