221211022001100 has 144 divisors (see below), whose sum is σ = 680002270298400. Its totient is φ = 55416144107520.

The previous prime is 221211022001093. The next prime is 221211022001141. The reversal of 221211022001100 is 1100220112122.

It is a super-2 number, since 2×221211022001100² (a number of 29 digits) contains 22 as substring.

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 221211022001100.

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, 343280185 + ... + 343923984.

Almost surely, 2^{221211022001100} is an apocalyptic number.

221211022001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211022001100 is an abundant number, since it is smaller than the sum of its proper divisors (458791248297300).

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

221211022001100 is a wasteful number, since it uses less digits than its factorization.

221211022001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687204252 (or 687204245 counting only the distinct ones).

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

Adding to 221211022001100 its reverse (1100220112122), we get a palindrome (222311242113222).

The spelling of 221211022001100 in words is "two hundred twenty-one trillion, two hundred eleven billion, twenty-two million, one thousand, one hundred".