221210211020 has 24 divisors (see below), whose sum is σ = 467226661104. Its totient is φ = 87972614336.

The previous prime is 221210211007. The next prime is 221210211023. The reversal of 221210211020 is 20112012122.

221210211020 is digitally balanced in base 2, 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 = 221210210986 and 221210211004.

It is not an unprimeable number, because it can be changed into a prime (221210211023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31963334 + ... + 31970253.

It is an arithmetic number, because the mean of its divisors is an integer number (19467777546).

Almost surely, 2^221210211020 is an apocalyptic number.

221210211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210211020 is an abundant number, since it is smaller than the sum of its proper divisors (246016450084).

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

221210211020 is a wasteful number, since it uses less digits than its factorization.

221210211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63933769 (or 63933767 counting only the distinct ones).

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

Adding to 221210211020 its reverse (20112012122), we get a palindrome (241322223142).

The spelling of 221210211020 in words is "two hundred twenty-one billion, two hundred ten million, two hundred eleven thousand, twenty".