21555543034445 has 16 divisors (see below), whose sum is σ = 29562089961600. Its totient is φ = 14780842609344.

The previous prime is 21555543034429. The next prime is 21555543034573. The reversal of 21555543034445 is 54443034555512.

It is not a de Polignac number, because 21555543034445 - 2⁴ = 21555543034429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21555543034393 and 21555543034402.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3271031 + ... + 7335579.

It is an arithmetic number, because the mean of its divisors is an integer number (1847630622600).

Almost surely, 2^{21555543034445} is an apocalyptic number.

It is an amenable number.

21555543034445 is a deficient number, since it is larger than the sum of its proper divisors (8006546927155).

21555543034445 is a wasteful number, since it uses less digits than its factorization.

21555543034445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216084.

The product of its (nonzero) digits is 14400000, while the sum is 50.

Adding to 21555543034445 its reverse (54443034555512), we get a palindrome (75998577589957).

The spelling of 21555543034445 in words is "twenty-one trillion, five hundred fifty-five billion, five hundred forty-three million, thirty-four thousand, four hundred forty-five".