21220212220120 has 32 divisors (see below), whose sum is σ = 47745639839520. Its totient is φ = 8488056026880.

The previous prime is 21220212220091. The next prime is 21220212220147. The reversal of 21220212220120 is 2102221202212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14082724 + ... + 15516556.

It is an arithmetic number, because the mean of its divisors is an integer number (1492051244985).

Almost surely, 2^{21220212220120} is an apocalyptic number.

21220212220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220212220120 is an abundant number, since it is smaller than the sum of its proper divisors (26525427619400).

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

21220212220120 is a wasteful number, since it uses less digits than its factorization.

21220212220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803835 (or 1803831 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21220212220120 its reverse (2102221202212), we get a palindrome (23322433422332).

The spelling of 21220212220120 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty".