221102021100 has 72 divisors (see below), whose sum is σ = 657011660368. Its totient is φ = 57367008000.

The previous prime is 221102021039. The next prime is 221102021113. The reversal of 221102021100 is 1120201122.

It is a super-2 number, since 2×221102021100² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9948451 + ... + 9970650.

Almost surely, 2^221102021100 is an apocalyptic number.

221102021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102021100 is an abundant number, since it is smaller than the sum of its proper divisors (435909639268).

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

221102021100 is a wasteful number, since it uses less digits than its factorization.

221102021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19919155 (or 19919148 counting only the distinct ones).

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

Adding to 221102021100 its reverse (1120201122), we get a palindrome (222222222222).

The spelling of 221102021100 in words is "two hundred twenty-one billion, one hundred two million, twenty-one thousand, one hundred".