211231022220020 has 96 divisors (see below), whose sum is σ = 489839035392000. Its totient is φ = 75870703071360.

The previous prime is 211231022219983. The next prime is 211231022220041. The reversal of 211231022220020 is 20022220132112.

It is a super-2 number, since 2×211231022220020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 211231022219974 and 211231022220001.

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 31 ways as a sum of consecutive naturals, for example, 90568481 + ... + 92871479.

It is an arithmetic number, because the mean of its divisors is an integer number (5102489952000).

Almost surely, 2^{211231022220020} is an apocalyptic number.

211231022220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211231022220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244919517696000).

211231022220020 is an abundant number, since it is smaller than the sum of its proper divisors (278608013171980).

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

211231022220020 is a wasteful number, since it uses less digits than its factorization.

211231022220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308125 (or 2308123 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 211231022220020 its reverse (20022220132112), we get a palindrome (231253242352132).

The spelling of 211231022220020 in words is "two hundred eleven trillion, two hundred thirty-one billion, twenty-two million, two hundred twenty thousand, twenty".