212100111020 has 48 divisors (see below), whose sum is σ = 509067693120. Its totient is φ = 72716120064.

The previous prime is 212100110969. The next prime is 212100111059. The reversal of 212100111020 is 20111001212.

It is a junction number, because it is equal to n+sod(n) for n = 212100110992 and 212100111010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3968636 + ... + 4021724.

It is an arithmetic number, because the mean of its divisors is an integer number (10605576940).

Almost surely, 2^212100111020 is an apocalyptic number.

212100111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212100111020 is an abundant number, since it is smaller than the sum of its proper divisors (296967582100).

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

212100111020 is a wasteful number, since it uses less digits than its factorization.

212100111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81642 (or 81640 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 212100111020 its reverse (20111001212), we get a palindrome (232211112232).

The spelling of 212100111020 in words is "two hundred twelve billion, one hundred million, one hundred eleven thousand, twenty".