21222121442120 has 64 divisors (see below), whose sum is σ = 48000714048000. Its totient is φ = 8444351139840.

The previous prime is 21222121442089. The next prime is 21222121442149. The reversal of 21222121442120 is 2124412122212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222121442120.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4159817 + ... + 7729703.

It is an arithmetic number, because the mean of its divisors is an integer number (750011157000).

Almost surely, 2^{21222121442120} is an apocalyptic number.

21222121442120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222121442120 is an abundant number, since it is smaller than the sum of its proper divisors (26778592605880).

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

21222121442120 is a wasteful number, since it uses less digits than its factorization.

21222121442120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570678 (or 3570674 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 21222121442120 its reverse (2124412122212), we get a palindrome (23346533564332).

The spelling of 21222121442120 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, four hundred forty-two thousand, one hundred twenty".