21121112120 has 64 divisors (see below), whose sum is σ = 52966288800. Its totient is φ = 7532974080.

The previous prime is 21121112113. The next prime is 21121112147. The reversal of 21121112120 is 2121112112.

It is a super-2 number, since 2×21121112120² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121112095 and 21121112104.

It is a congruent number.

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, 804461 + ... + 830300.

Almost surely, 2^21121112120 is an apocalyptic number.

21121112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121112120 is an abundant number, since it is smaller than the sum of its proper divisors (31845176680).

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

21121112120 is a wasteful number, since it uses less digits than its factorization.

21121112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634808 (or 1634804 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121112120 its reverse (2121112112), we get a palindrome (23242224232).

The spelling of 21121112120 in words is "twenty-one billion, one hundred twenty-one million, one hundred twelve thousand, one hundred twenty".