21212241144 has 16 divisors (see below), whose sum is σ = 53030602920. Its totient is φ = 7070747040.

The previous prime is 21212241143. The next prime is 21212241163. The reversal of 21212241144 is 44114221212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 883843381 = 21212241144 / (2 + 1 + 2 + 1 + 2 + 2 + 4 + 1 + 1 + 4 + 4).

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 (21212241143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 441921667 + ... + 441921714.

Almost surely, 2^21212241144 is an apocalyptic number.

21212241144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21212241144 is an abundant number, since it is smaller than the sum of its proper divisors (31818361776).

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

21212241144 is a wasteful number, since it uses less digits than its factorization.

21212241144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883843390 (or 883843386 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

Adding to 21212241144 its reverse (44114221212), we get a palindrome (65326462356).

The spelling of 21212241144 in words is "twenty-one billion, two hundred twelve million, two hundred forty-one thousand, one hundred forty-four".