2121211220 has 24 divisors (see below), whose sum is σ = 4455628800. Its totient is φ = 848277792.

The previous prime is 2121211207. The next prime is 2121211237. The reversal of 2121211220 is 221121212.

It is a junction number, because it is equal to n+sod(n) for n = 2121211195 and 2121211204.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 92021 + ... + 112739.

It is an arithmetic number, because the mean of its divisors is an integer number (185651200).

Almost surely, 2^2121211220 is an apocalyptic number.

2121211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121211220 is an abundant number, since it is smaller than the sum of its proper divisors (2334417580).

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

2121211220 is a wasteful number, since it uses less digits than its factorization.

2121211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25847 (or 25845 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2121211220 is about 46056.6088634411. The cubic root of 2121211220 is about 1284.8762607511.

Adding to 2121211220 its reverse (221121212), we get a palindrome (2342332432).

The spelling of 2121211220 in words is "two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty".