21244254132 has 12 divisors (see below), whose sum is σ = 49569926336. Its totient is φ = 7081418040.

The previous prime is 21244254131. The next prime is 21244254211. The reversal of 21244254132 is 23145244212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21244254132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244254131) 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, 885177244 + ... + 885177267.

Almost surely, 2^21244254132 is an apocalyptic number.

It is an amenable number.

21244254132 is an abundant number, since it is smaller than the sum of its proper divisors (28325672204).

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

21244254132 is a wasteful number, since it uses less digits than its factorization.

21244254132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770354518 (or 1770354516 counting only the distinct ones).

The product of its digits is 15360, while the sum is 30.

Adding to 21244254132 its reverse (23145244212), we get a palindrome (44389498344).

The spelling of 21244254132 in words is "twenty-one billion, two hundred forty-four million, two hundred fifty-four thousand, one hundred thirty-two".