21432241212 has 24 divisors (see below), whose sum is σ = 50097403776. Its totient is φ = 7131388848.

The previous prime is 21432241153. The next prime is 21432241213. The reversal of 21432241212 is 21214223412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432241213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1579408 + ... + 1592919.

It is an arithmetic number, because the mean of its divisors is an integer number (2087391824).

Almost surely, 2^21432241212 is an apocalyptic number.

It is an amenable number.

21432241212 is an abundant number, since it is smaller than the sum of its proper divisors (28665162564).

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

21432241212 is a wasteful number, since it uses less digits than its factorization.

21432241212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172897 (or 3172895 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

Adding to 21432241212 its reverse (21214223412), we get a palindrome (42646464624).

The spelling of 21432241212 in words is "twenty-one billion, four hundred thirty-two million, two hundred forty-one thousand, two hundred twelve".