21110321120 has 72 divisors (see below), whose sum is σ = 58015707624. Its totient is φ = 7237821696.

The previous prime is 21110321117. The next prime is 21110321123. The reversal of 21110321120 is 2112301112.

It is an interprime number because it is at equal distance from previous prime (21110321117) and next prime (21110321123).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21110321095 and 21110321104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110321123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1338482 + ... + 1354161.

It is an arithmetic number, because the mean of its divisors is an integer number (805773717).

Almost surely, 2^21110321120 is an apocalyptic number.

21110321120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110321120 is an abundant number, since it is smaller than the sum of its proper divisors (36905386504).

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

21110321120 is a wasteful number, since it uses less digits than its factorization.

21110321120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692672 (or 2692657 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21110321120 its reverse (2112301112), we get a palindrome (23222622232).

The spelling of 21110321120 in words is "twenty-one billion, one hundred ten million, three hundred twenty-one thousand, one hundred twenty".