21551432103441 has 24 divisors (see below), whose sum is σ = 31616581705280. Its totient is φ = 14143274472096.

The previous prime is 21551432103407. The next prime is 21551432103457. The reversal of 21551432103441 is 14430123415512.

21551432103441 is a `hidden beast` number, since 2 + 1 + 5 + 514 + 32 + 103 + 4 + 4 + 1 = 666.

It is not a de Polignac number, because 21551432103441 - 2²¹ = 21551430006289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21551432103396 and 21551432103405.

It is not an unprimeable number, because it can be changed into a prime (21551432107441) 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 23 ways as a sum of consecutive naturals, for example, 11643685 + ... + 13367058.

Almost surely, 2^{21551432103441} is an apocalyptic number.

It is an amenable number.

21551432103441 is a deficient number, since it is larger than the sum of its proper divisors (10065149601839).

21551432103441 is a wasteful number, since it uses less digits than its factorization.

21551432103441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25012245 (or 25012242 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 21551432103441 its reverse (14430123415512), we get a palindrome (35981555518953).

The spelling of 21551432103441 in words is "twenty-one trillion, five hundred fifty-one billion, four hundred thirty-two million, one hundred three thousand, four hundred forty-one".