21120021220110 has 32 divisors (see below), whose sum is σ = 50688173446560. Its totient is φ = 5631992045568.

The previous prime is 21120021220073. The next prime is 21120021220141. The reversal of 21120021220110 is 1102212002112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21120021220110.

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 15 ways as a sum of consecutive naturals, for example, 20797134 + ... + 21789006.

It is an arithmetic number, because the mean of its divisors is an integer number (1584005420205).

Almost surely, 2^{21120021220110} is an apocalyptic number.

21120021220110 is an abundant number, since it is smaller than the sum of its proper divisors (29568152226450).

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

21120021220110 is a wasteful number, since it uses less digits than its factorization.

21120021220110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701652.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120021220110 its reverse (1102212002112), we get a palindrome (22222233222222).

The spelling of 21120021220110 in words is "twenty-one trillion, one hundred twenty billion, twenty-one million, two hundred twenty thousand, one hundred ten".