21013231211112 has 96 divisors (see below), whose sum is σ = 61947029361600. Its totient is φ = 5921536755456.

The previous prime is 21013231211087. The next prime is 21013231211183. The reversal of 21013231211112 is 21111213231012.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 23 ways as a sum of consecutive naturals, for example, 122300412 + ... + 122472107.

It is an arithmetic number, because the mean of its divisors is an integer number (645281555850).

Almost surely, 2^{21013231211112} is an apocalyptic number.

It is an amenable number.

21013231211112 is an abundant number, since it is smaller than the sum of its proper divisors (40933798150488).

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

21013231211112 is a wasteful number, since it uses less digits than its factorization.

21013231211112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244772615 (or 244772604 counting only the distinct ones).

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

Adding to 21013231211112 its reverse (21111213231012), we get a palindrome (42124444442124).

The spelling of 21013231211112 in words is "twenty-one trillion, thirteen billion, two hundred thirty-one million, two hundred eleven thousand, one hundred twelve".