211321331320 has 128 divisors (see below), whose sum is σ = 536140684800. Its totient is φ = 74302732800.

The previous prime is 211321331279. The next prime is 211321331323. The reversal of 211321331320 is 23133123112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 211321331291 and 211321331300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211321331323) 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, 1516837 + ... + 1650283.

It is an arithmetic number, because the mean of its divisors is an integer number (4188599100).

Almost surely, 2^211321331320 is an apocalyptic number.

211321331320 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 211321331320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268070342400).

211321331320 is an abundant number, since it is smaller than the sum of its proper divisors (324819353480).

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

211321331320 is a wasteful number, since it uses less digits than its factorization.

211321331320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133589 (or 133585 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 211321331320 its reverse (23133123112), we get a palindrome (234454454432).

The spelling of 211321331320 in words is "two hundred eleven billion, three hundred twenty-one million, three hundred thirty-one thousand, three hundred twenty".