221000122120 has 64 divisors (see below), whose sum is σ = 498938875200. Its totient is φ = 88100125440.

The previous prime is 221000122117. The next prime is 221000122127. The reversal of 221000122120 is 21221000122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221000122120.

It is not an unprimeable number, because it can be changed into a prime (221000122127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44816055 + ... + 44820985.

It is an arithmetic number, because the mean of its divisors is an integer number (7795919925).

Almost surely, 2^221000122120 is an apocalyptic number.

221000122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000122120 is an abundant number, since it is smaller than the sum of its proper divisors (277938753080).

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

221000122120 is a wasteful number, since it uses less digits than its factorization.

221000122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518 (or 8514 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221000122120 its reverse (21221000122), we get a palindrome (242221122242).

The spelling of 221000122120 in words is "two hundred twenty-one billion, one hundred twenty-two thousand, one hundred twenty".