21122021244320 has 48 divisors (see below), whose sum is σ = 49982179622760. Its totient is φ = 8435025736704.

The previous prime is 21122021244281. The next prime is 21122021244353. The reversal of 21122021244320 is 2344212022112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15487341676816 + 5634679567504 = 3935396^2 + 2373748^2 .

It is a super-2 number, since 2×21122021244320² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122021244320.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107579435 + ... + 107775594.

Almost surely, 2^{21122021244320} is an apocalyptic number.

21122021244320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122021244320 is an abundant number, since it is smaller than the sum of its proper divisors (28860158378440).

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

21122021244320 is a wasteful number, since it uses less digits than its factorization.

21122021244320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215355657 (or 215355649 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21122021244320 its reverse (2344212022112), we get a palindrome (23466233266432).

The spelling of 21122021244320 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred forty-four thousand, three hundred twenty".