221323112220 has 48 divisors (see below), whose sum is σ = 708233960448. Its totient is φ = 50588139840.

The previous prime is 221323112177. The next prime is 221323112233. The reversal of 221323112220 is 22211323122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263479476 + ... + 263480315.

It is an arithmetic number, because the mean of its divisors is an integer number (14754874176).

Almost surely, 2^221323112220 is an apocalyptic number.

221323112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221323112220 is an abundant number, since it is smaller than the sum of its proper divisors (486910848228).

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

221323112220 is a wasteful number, since it uses less digits than its factorization.

221323112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526959810 (or 526959808 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 221323112220 its reverse (22211323122), we get a palindrome (243534435342).

It can be divided in two parts, 22132311 and 2220, that added together give a triangular number (22134531 = T₆₆₅₃).

The spelling of 221323112220 in words is "two hundred twenty-one billion, three hundred twenty-three million, one hundred twelve thousand, two hundred twenty".