221020211100 has 108 divisors (see below), whose sum is σ = 692460403656. Its totient is φ = 54404962560.

The previous prime is 221020211063. The next prime is 221020211143. The reversal of 221020211100 is 1112020122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2128987 + ... + 2230386.

Almost surely, 2^221020211100 is an apocalyptic number.

221020211100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020211100 is an abundant number, since it is smaller than the sum of its proper divisors (471440192556).

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

221020211100 is a wasteful number, since it uses less digits than its factorization.

221020211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359416 (or 4359396 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221020211100 its reverse (1112020122), we get a palindrome (222132231222).

The spelling of 221020211100 in words is "two hundred twenty-one billion, twenty million, two hundred eleven thousand, one hundred".