21211112120 has 32 divisors (see below), whose sum is σ = 52063639920. Its totient is φ = 7713131520.

The previous prime is 21211112017. The next prime is 21211112147. The reversal of 21211112120 is 2121111212.

It is a super-2 number, since 2×21211112120² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211112095 and 21211112104.

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 7 ways as a sum of consecutive naturals, for example, 24103097 + ... + 24103976.

Almost surely, 2^21211112120 is an apocalyptic number.

21211112120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211112120 is an abundant number, since it is smaller than the sum of its proper divisors (30852527800).

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

21211112120 is a wasteful number, since it uses less digits than its factorization.

21211112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48207095 (or 48207091 counting only the distinct ones).

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

Adding to 21211112120 its reverse (2121111212), we get a palindrome (23332223332).

It can be divided in two parts, 21211 and 112120, that added together give a palindrome (133331).

The spelling of 21211112120 in words is "twenty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty".