211121211202020 has 216 divisors, whose sum is σ = 777345677769024. Its totient is φ = 46158177808512.

The previous prime is 211121211202009. The next prime is 211121211202067. The reversal of 211121211202020 is 20202112121112.

211121211202020 is a `hidden beast` number, since 211 + 1 + 21 + 211 + 20 + 202 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211121211201984 and 211121211202002.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 520158994 + ... + 520564713.

It is an arithmetic number, because the mean of its divisors is an integer number (3598822582264).

Almost surely, 2^{211121211202020} is an apocalyptic number.

211121211202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211121211202020 is an abundant number, since it is smaller than the sum of its proper divisors (566224466567004).

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

211121211202020 is a wasteful number, since it uses less digits than its factorization.

211121211202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040723759 (or 1040723747 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211121211202020 its reverse (20202112121112), we get a palindrome (231323323323132).

The spelling of 211121211202020 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred eleven million, two hundred two thousand, twenty".