21242433212 has 48 divisors (see below), whose sum is σ = 49912300032. Its totient is φ = 7639634880.

The previous prime is 21242433151. The next prime is 21242433241. The reversal of 21242433212 is 21233424212.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2648648 + ... + 2656655.

It is an arithmetic number, because the mean of its divisors is an integer number (1039839584).

Almost surely, 2^21242433212 is an apocalyptic number.

21242433212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21242433212 is an abundant number, since it is smaller than the sum of its proper divisors (28669866820).

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

21242433212 is a wasteful number, since it uses less digits than its factorization.

21242433212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305338 (or 5305336 counting only the distinct ones).

The product of its digits is 4608, while the sum is 26.

Adding to 21242433212 its reverse (21233424212), we get a palindrome (42475857424).

It can be divided in two parts, 21242 and 433212, that added together give a palindrome (454454).

The spelling of 21242433212 in words is "twenty-one billion, two hundred forty-two million, four hundred thirty-three thousand, two hundred twelve".