21111213221232 has 80 divisors (see below), whose sum is σ = 57665119196160. Its totient is φ = 6636803337216.

The previous prime is 21111213221207. The next prime is 21111213221249. The reversal of 21111213221232 is 23212231211112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51698553 + ... + 52105304.

It is an arithmetic number, because the mean of its divisors is an integer number (720813989952).

Almost surely, 2^{21111213221232} is an apocalyptic number.

It is an amenable number.

21111213221232 is an abundant number, since it is smaller than the sum of its proper divisors (36553905974928).

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

21111213221232 is a wasteful number, since it uses less digits than its factorization.

21111213221232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103804110 (or 103804104 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

Adding to 21111213221232 its reverse (23212231211112), we get a palindrome (44323444432344).

The spelling of 21111213221232 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred thirty-two".