221001021211100 has 72 divisors (see below), whose sum is σ = 516945516390240. Its totient is φ = 81524043175680.

The previous prime is 221001021211079. The next prime is 221001021211109. The reversal of 221001021211100 is 1112120100122.

It is a super-2 number, since 2×221001021211100² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001021211109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78124232 + ... + 80903631.

Almost surely, 2^{221001021211100} is an apocalyptic number.

221001021211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001021211100 is an abundant number, since it is smaller than the sum of its proper divisors (295944495179140).

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

221001021211100 is a wasteful number, since it uses less digits than its factorization.

221001021211100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159028959 (or 159028952 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221001021211100 its reverse (1112120100122), we get a palindrome (222113141311222).

The spelling of 221001021211100 in words is "two hundred twenty-one trillion, one billion, twenty-one million, two hundred eleven thousand, one hundred".