21021122112 has 112 divisors (see below), whose sum is σ = 58596580800. Its totient is φ = 6632478720.

The previous prime is 21021122071. The next prime is 21021122137. The reversal of 21021122112 is 21122112012.

It is a junction number, because it is equal to n+sod(n) for n = 21021122091 and 21021122100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6524662 + ... + 6527882.

Almost surely, 2^21021122112 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 21021122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29298290400).

21021122112 is an abundant number, since it is smaller than the sum of its proper divisors (37575458688).

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

21021122112 is a wasteful number, since it uses less digits than its factorization.

21021122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5044 (or 5034 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021122112 its reverse (21122112012), we get a palindrome (42143234124).

The spelling of 21021122112 in words is "twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred twelve".