212221131420 has 96 divisors (see below), whose sum is σ = 608221426176. Its totient is φ = 55273657600.

The previous prime is 212221131377. The next prime is 212221131431. The reversal of 212221131420 is 24131122212.

It is a happy number.

It is a super-2 number, since 2×212221131420² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223030 + ... + 688610.

It is an arithmetic number, because the mean of its divisors is an integer number (6335639856).

Almost surely, 2^212221131420 is an apocalyptic number.

212221131420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212221131420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304110713088).

212221131420 is an abundant number, since it is smaller than the sum of its proper divisors (396000294756).

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

212221131420 is a wasteful number, since it uses less digits than its factorization.

212221131420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465771 (or 465769 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 212221131420 its reverse (24131122212), we get a palindrome (236352253632).

The spelling of 212221131420 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred thirty-one thousand, four hundred twenty".