21021231131112 has 128 divisors (see below), whose sum is σ = 55509739776000. Its totient is φ = 6615422772480.

The previous prime is 21021231131083. The next prime is 21021231131119. The reversal of 21021231131112 is 21113113212012.

It is not an unprimeable number, because it can be changed into a prime (21021231131119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252553662 + ... + 252636882.

It is an arithmetic number, because the mean of its divisors is an integer number (433669842000).

Almost surely, 2^{21021231131112} 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 21021231131112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27754869888000).

21021231131112 is an abundant number, since it is smaller than the sum of its proper divisors (34488508644888).

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

21021231131112 is a wasteful number, since it uses less digits than its factorization.

21021231131112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85151 (or 85147 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21021231131112 its reverse (21113113212012), we get a palindrome (42134344343124).

The spelling of 21021231131112 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-one million, one hundred thirty-one thousand, one hundred twelve".