221120001100 has 36 divisors (see below), whose sum is σ = 479864771064. Its totient is φ = 88441665280.

The previous prime is 221120001061. The next prime is 221120001149. The reversal of 221120001100 is 1100021122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1475847 + ... + 1618753.

It is an arithmetic number, because the mean of its divisors is an integer number (13329576974).

Almost surely, 2^221120001100 is an apocalyptic number.

221120001100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221120001100 is an abundant number, since it is smaller than the sum of its proper divisors (258744769964).

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

221120001100 is a wasteful number, since it uses less digits than its factorization.

221120001100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158394 (or 158387 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 221120001100 its reverse (1100021122), we get a palindrome (222220022222).

The spelling of 221120001100 in words is "two hundred twenty-one billion, one hundred twenty million, one thousand, one hundred".