221001220211100 has 216 divisors, whose sum is σ = 745433524700928. Its totient is φ = 50405460336000.

The previous prime is 221001220211053. The next prime is 221001220211173. The reversal of 221001220211100 is 1112022100122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221001220211100.

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, 9429426 + ... + 23041625.

Almost surely, 2^{221001220211100} is an apocalyptic number.

221001220211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221001220211100 is an abundant number, since it is smaller than the sum of its proper divisors (524432304489828).

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

221001220211100 is a wasteful number, since it uses less digits than its factorization.

221001220211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32471545 (or 32471531 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221001220211100 its reverse (1112022100122), we get a palindrome (222113242311222).

The spelling of 221001220211100 in words is "two hundred twenty-one trillion, one billion, two hundred twenty million, two hundred eleven thousand, one hundred".