211211100200020 has 48 divisors (see below), whose sum is σ = 449325952588800. Its totient is φ = 83383785239040.

The previous prime is 211211100199987. The next prime is 211211100200069. The reversal of 211211100200020 is 20002001112112.

It is a super-2 number, since 2×211211100200020² (a number of 29 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 20803765 + ... + 29244124.

It is an arithmetic number, because the mean of its divisors is an integer number (9360957345600).

Almost surely, 2^{211211100200020} is an apocalyptic number.

211211100200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211211100200020 is an abundant number, since it is smaller than the sum of its proper divisors (238114852388780).

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

211211100200020 is a wasteful number, since it uses less digits than its factorization.

211211100200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50050648 (or 50050646 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211211100200020 its reverse (20002001112112), we get a palindrome (231213101312132).

The spelling of 211211100200020 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred million, two hundred thousand, twenty".