221100021212202 has 128 divisors (see below), whose sum is σ = 537497661254400. Its totient is φ = 66812986598400.

The previous prime is 221100021212201. The next prime is 221100021212219. The reversal of 221100021212202 is 202212120001122.

It is a happy number.

221100021212202 is a `hidden beast` number, since 221 + 10 + 0 + 0 + 21 + 212 + 202 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (221100021212201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 440347998 + ... + 440849814.

It is an arithmetic number, because the mean of its divisors is an integer number (4199200478550).

Almost surely, 2^{221100021212202} is an apocalyptic number.

221100021212202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221100021212202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268748830627200).

221100021212202 is an abundant number, since it is smaller than the sum of its proper divisors (316397640042198).

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

221100021212202 is a wasteful number, since it uses less digits than its factorization.

221100021212202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503909 (or 503903 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221100021212202 its reverse (202212120001122), we get a palindrome (423312141213324).

The spelling of 221100021212202 in words is "two hundred twenty-one trillion, one hundred billion, twenty-one million, two hundred twelve thousand, two hundred two".