21551551124332 has 12 divisors (see below), whose sum is σ = 37722038319280. Its totient is φ = 10773825890256.

The previous prime is 21551551124287. The next prime is 21551551124333. The reversal of 21551551124332 is 23342115515512.

It is not an unprimeable number, because it can be changed into a prime (21551551124333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487393107 + ... + 487437322.

Almost surely, 2^{21551551124332} is an apocalyptic number.

It is an amenable number.

21551551124332 is a deficient number, since it is larger than the sum of its proper divisors (16170487194948).

21551551124332 is a wasteful number, since it uses less digits than its factorization.

21551551124332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974835960 (or 974835958 counting only the distinct ones).

The product of its digits is 180000, while the sum is 40.

Adding to 21551551124332 its reverse (23342115515512), we get a palindrome (44893666639844).

The spelling of 21551551124332 in words is "twenty-one trillion, five hundred fifty-one billion, five hundred fifty-one million, one hundred twenty-four thousand, three hundred thirty-two".