212101111121020 has 96 divisors (see below), whose sum is σ = 497762242600896. Its totient is φ = 75245523302400.

The previous prime is 212101111121017. The next prime is 212101111121027. The reversal of 212101111121020 is 20121111101212.

It is a junction number, because it is equal to n+sod(n) for n = 212101111120985 and 212101111121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101111121027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1206039414 + ... + 1206215266.

It is an arithmetic number, because the mean of its divisors is an integer number (5185023360426).

Almost surely, 2^{212101111121020} is an apocalyptic number.

212101111121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212101111121020 is an abundant number, since it is smaller than the sum of its proper divisors (285661131479876).

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

212101111121020 is a wasteful number, since it uses less digits than its factorization.

212101111121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309631 (or 309629 counting only the distinct ones).

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

Adding to 212101111121020 its reverse (20121111101212), we get a palindrome (232222222222232).

The spelling of 212101111121020 in words is "two hundred twelve trillion, one hundred one billion, one hundred eleven million, one hundred twenty-one thousand, twenty".