221111221020 has 24 divisors (see below), whose sum is σ = 619111419024. Its totient is φ = 58962992256.

The previous prime is 221111221007. The next prime is 221111221031. The reversal of 221111221020 is 20122111122.

221111221020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842593449 + ... + 1842593568.

It is an arithmetic number, because the mean of its divisors is an integer number (25796309126).

Almost surely, 2^221111221020 is an apocalyptic number.

221111221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221111221020 is an abundant number, since it is smaller than the sum of its proper divisors (398000198004).

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

221111221020 is a wasteful number, since it uses less digits than its factorization.

221111221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685187029 (or 3685187027 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221111221020 its reverse (20122111122), we get a palindrome (241233332142).

The spelling of 221111221020 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, twenty".