221021032122 has 48 divisors (see below), whose sum is σ = 523069196832. Its totient is φ = 66891987360.

The previous prime is 221021032091. The next prime is 221021032123. The reversal of 221021032122 is 221230120122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221021032095 and 221021032104.

It is not an unprimeable number, because it can be changed into a prime (221021032123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 542488 + ... + 858099.

It is an arithmetic number, because the mean of its divisors is an integer number (10897274934).

Almost surely, 2^221021032122 is an apocalyptic number.

221021032122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221021032122 is an abundant number, since it is smaller than the sum of its proper divisors (302048164710).

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

221021032122 is a wasteful number, since it uses less digits than its factorization.

221021032122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401403 (or 1401400 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 221021032122 its reverse (221230120122), we get a palindrome (442251152244).

The spelling of 221021032122 in words is "two hundred twenty-one billion, twenty-one million, thirty-two thousand, one hundred twenty-two".