21211021121112 has 64 divisors (see below), whose sum is σ = 58922968428000. Its totient is φ = 7069924536192.

The previous prime is 21211021121089. The next prime is 21211021121177. The reversal of 21211021121112 is 21112112011212.

It is a happy number.

21211021121112 is a `hidden beast` number, since 21 + 211 + 0 + 211 + 211 + 12 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804214 + ... + 6562682.

Almost surely, 2^{21211021121112} is an apocalyptic number.

It is an amenable number.

21211021121112 is an abundant number, since it is smaller than the sum of its proper divisors (37711947306888).

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

21211021121112 is a wasteful number, since it uses less digits than its factorization.

21211021121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5775537 (or 5775527 counting only the distinct ones).

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

Adding to 21211021121112 its reverse (21112112011212), we get a palindrome (42323133132324).

The spelling of 21211021121112 in words is "twenty-one trillion, two hundred eleven billion, twenty-one million, one hundred twenty-one thousand, one hundred twelve".