21111020221110 has 32 divisors (see below), whose sum is σ = 51158355805440. Its totient is φ = 5574949028448.

The previous prime is 21111020221043. The next prime is 21111020221111. The reversal of 21111020221110 is 1112202011112.

It is a happy number.

It is a super-2 number, since 2×21111020221110² (a number of 27 digits) contains 22 as substring.

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 21111020221110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111020221111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3416019600 + ... + 3416025779.

It is an arithmetic number, because the mean of its divisors is an integer number (1598698618920).

Almost surely, 2^{21111020221110} is an apocalyptic number.

21111020221110 is an abundant number, since it is smaller than the sum of its proper divisors (30047335584330).

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

21111020221110 is a wasteful number, since it uses less digits than its factorization.

21111020221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832045492.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111020221110 its reverse (1112202011112), we get a palindrome (22223222232222).

The spelling of 21111020221110 in words is "twenty-one trillion, one hundred eleven billion, twenty million, two hundred twenty-one thousand, one hundred ten".