221201211002100 has 144 divisors (see below), whose sum is σ = 774464475351168. Its totient is φ = 47586142863360.

The previous prime is 221201211002087. The next prime is 221201211002113. The reversal of 221201211002100 is 1200112102122.

It is an interprime number because it is at equal distance from previous prime (221201211002087) and next prime (221201211002113).

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 221201211002100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3098020477 + ... + 3098091876.

It is an arithmetic number, because the mean of its divisors is an integer number (5378225523272).

Almost surely, 2^{221201211002100} is an apocalyptic number.

221201211002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221201211002100 is an abundant number, since it is smaller than the sum of its proper divisors (553263264349068).

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

221201211002100 is a wasteful number, since it uses less digits than its factorization.

221201211002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6196112394 (or 6196112387 counting only the distinct ones).

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

Adding to 221201211002100 its reverse (1200112102122), we get a palindrome (222401323104222).

The spelling of 221201211002100 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred eleven million, two thousand, one hundred".