212221021020 has 48 divisors (see below), whose sum is σ = 594260731008. Its totient is φ = 56588284480.

The previous prime is 212221021013. The next prime is 212221021039. The reversal of 212221021020 is 20120122212.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 789355 + ... + 1023485.

It is an arithmetic number, because the mean of its divisors is an integer number (12380431896).

Almost surely, 2^212221021020 is an apocalyptic number.

212221021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221021020 is an abundant number, since it is smaller than the sum of its proper divisors (382039709988).

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

212221021020 is a wasteful number, since it uses less digits than its factorization.

212221021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249250 (or 249248 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212221021020 its reverse (20120122212), we get a palindrome (232341143232).

The spelling of 212221021020 in words is "two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, twenty".