21010122220120 has 96 divisors (see below), whose sum is σ = 55017512776800. Its totient is φ = 7190630036480.

The previous prime is 21010122220079. The next prime is 21010122220159. The reversal of 21010122220120 is 2102222101012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21010122220094 and 21010122220103.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 127592260 + ... + 127756819.

It is an arithmetic number, because the mean of its divisors is an integer number (573099091425).

Almost surely, 2^{21010122220120} is an apocalyptic number.

21010122220120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010122220120 is an abundant number, since it is smaller than the sum of its proper divisors (34007390556680).

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

21010122220120 is a wasteful number, since it uses less digits than its factorization.

21010122220120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255349129 (or 255349114 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21010122220120 its reverse (2102222101012), we get a palindrome (23112344321132).

The spelling of 21010122220120 in words is "twenty-one trillion, ten billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty".