221210323420 has 24 divisors (see below), whose sum is σ = 465857676144. Its totient is φ = 88233463296.

The previous prime is 221210323357. The next prime is 221210323421. The reversal of 221210323420 is 24323012122.

221210323420 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 = 221210323391 and 221210323400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210323421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15659394 + ... + 15673513.

It is an arithmetic number, because the mean of its divisors is an integer number (19410736506).

Almost surely, 2^221210323420 is an apocalyptic number.

221210323420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210323420 is an abundant number, since it is smaller than the sum of its proper divisors (244647352724).

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

221210323420 is a wasteful number, since it uses less digits than its factorization.

221210323420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31333269 (or 31333267 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 221210323420 its reverse (24323012122), we get a palindrome (245533335542).

The spelling of 221210323420 in words is "two hundred twenty-one billion, two hundred ten million, three hundred twenty-three thousand, four hundred twenty".