211320122220020 has 96 divisors (see below), whose sum is σ = 492353973296640. Its totient is φ = 75536114232960.

The previous prime is 211320122219989. The next prime is 211320122220023. The reversal of 211320122220020 is 20022221023112.

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 = 211320122219974 and 211320122220001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211320122220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193155059 + ... + 194246021.

It is an arithmetic number, because the mean of its divisors is an integer number (5128687221840).

Almost surely, 2^{211320122220020} is an apocalyptic number.

211320122220020 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 211320122220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246176986648320).

211320122220020 is an abundant number, since it is smaller than the sum of its proper divisors (281033851076620).

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

211320122220020 is a wasteful number, since it uses less digits than its factorization.

211320122220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105965 (or 1105963 counting only the distinct ones).

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

Adding to 211320122220020 its reverse (20022221023112), we get a palindrome (231342343243132).

The spelling of 211320122220020 in words is "two hundred eleven trillion, three hundred twenty billion, one hundred twenty-two million, two hundred twenty thousand, twenty".