221121021020 has 12 divisors (see below), whose sum is σ = 464354144184. Its totient is φ = 88448408400.

The previous prime is 221121020971. The next prime is 221121021029. The reversal of 221121021020 is 20120121122.

221121021020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221121020986 and 221121021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121021029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5528025506 + ... + 5528025545.

It is an arithmetic number, because the mean of its divisors is an integer number (38696178682).

Almost surely, 2^221121021020 is an apocalyptic number.

221121021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121021020 is an abundant number, since it is smaller than the sum of its proper divisors (243233123164).

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

221121021020 is a wasteful number, since it uses less digits than its factorization.

221121021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11056051060 (or 11056051058 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221121021020 its reverse (20120121122), we get a palindrome (241241142142).

The spelling of 221121021020 in words is "two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, twenty".