211321021110 has 64 divisors (see below), whose sum is σ = 516449032704. Its totient is φ = 55327910400.

The previous prime is 211321021091. The next prime is 211321021139. The reversal of 211321021110 is 11120123112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 211321021110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 307497 + ... + 719163.

It is an arithmetic number, because the mean of its divisors is an integer number (8069516136).

Almost surely, 2^211321021110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211321021110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258224516352).

211321021110 is an abundant number, since it is smaller than the sum of its proper divisors (305128011594).

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

211321021110 is a wasteful number, since it uses less digits than its factorization.

211321021110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411989.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 211321021110 its reverse (11120123112), we get a palindrome (222441144222).

The spelling of 211321021110 in words is "two hundred eleven billion, three hundred twenty-one million, twenty-one thousand, one hundred ten".