21221111201112 has 192 divisors, whose sum is σ = 61600831680960. Its totient is φ = 6582508416000.

The previous prime is 21221111201111. The next prime is 21221111201117. The reversal of 21221111201112 is 21110211112212.

It is a happy number.

21221111201112 is a `hidden beast` number, since 21 + 221 + 111 + 201 + 112 = 666.

It is a super-2 number, since 2×21221111201112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221111201111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 741438162 + ... + 741466782.

It is an arithmetic number, because the mean of its divisors is an integer number (320837665005).

Almost surely, 2^{21221111201112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21221111201112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30800415840480).

21221111201112 is an abundant number, since it is smaller than the sum of its proper divisors (40379720479848).

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

21221111201112 is a wasteful number, since it uses less digits than its factorization.

21221111201112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40794 (or 40787 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 21221111201112 its reverse (21110211112212), we get a palindrome (42331322313324).

The spelling of 21221111201112 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred one thousand, one hundred twelve".