21121212330232 has 64 divisors (see below), whose sum is σ = 46335128716800. Its totient is φ = 8837078140800.

The previous prime is 21121212330227. The next prime is 21121212330233. The reversal of 21121212330232 is 23203321212112.

It is a super-2 number, since 2×21121212330232² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121212330197 and 21121212330206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121212330233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2724357 + ... + 7047307.

It is an arithmetic number, because the mean of its divisors is an integer number (723986386200).

Almost surely, 2^{21121212330232} 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 21121212330232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23167564358400).

21121212330232 is an abundant number, since it is smaller than the sum of its proper divisors (25213916386568).

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

21121212330232 is a wasteful number, since it uses less digits than its factorization.

21121212330232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325036 (or 4325032 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21121212330232 its reverse (23203321212112), we get a palindrome (44324533542344).

The spelling of 21121212330232 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, three hundred thirty thousand, two hundred thirty-two".