212221121020 has 12 divisors (see below), whose sum is σ = 445664354184. Its totient is φ = 84888448400.

The previous prime is 212221120913. The next prime is 212221121029. The reversal of 212221121020 is 20121122212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 212221120985 and 212221121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221121029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5305528006 + ... + 5305528045.

It is an arithmetic number, because the mean of its divisors is an integer number (37138696182).

Almost surely, 2^212221121020 is an apocalyptic number.

212221121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221121020 is an abundant number, since it is smaller than the sum of its proper divisors (233443233164).

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

212221121020 is a wasteful number, since it uses less digits than its factorization.

212221121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611056060 (or 10611056058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212221121020 its reverse (20121122212), we get a palindrome (232342243232).

The spelling of 212221121020 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, twenty".