21212022221120 has 28 divisors (see below), whose sum is σ = 50511127914804. Its totient is φ = 8484808888320.

The previous prime is 21212022221111. The next prime is 21212022221141. The reversal of 21212022221120 is 2112222021212.

It can be written as a sum of positive squares in 2 ways, for example, as 8380839721024 + 12831182500096 = 2894968^2 + 3582064^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21212022221092 and 21212022221101.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 33143784401 + ... + 33143785040.

Almost surely, 2^{21212022221120} is an apocalyptic number.

21212022221120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212022221120 is an abundant number, since it is smaller than the sum of its proper divisors (29299105693684).

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

21212022221120 is an equidigital number, since it uses as much as digits as its factorization.

21212022221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66287569458 (or 66287569448 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21212022221120 its reverse (2112222021212), we get a palindrome (23324244242332).

The spelling of 21212022221120 in words is "twenty-one trillion, two hundred twelve billion, twenty-two million, two hundred twenty-one thousand, one hundred twenty".