21550343212055 has 12 divisors (see below), whose sum is σ = 30082519912680. Its totient is φ = 14777378202384.

The previous prime is 21550343212037. The next prime is 21550343212063. The reversal of 21550343212055 is 55021234305512.

It is a de Polignac number, because none of the positive numbers 2^k-21550343212055 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43980292025 + ... + 43980292514.

It is an arithmetic number, because the mean of its divisors is an integer number (2506876659390).

Almost surely, 2^{21550343212055} is an apocalyptic number.

21550343212055 is a deficient number, since it is larger than the sum of its proper divisors (8532176700625).

21550343212055 is an equidigital number, since it uses as much as digits as its factorization.

21550343212055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87960584558 (or 87960584551 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 21550343212055 its reverse (55021234305512), we get a palindrome (76571577517567).

The spelling of 21550343212055 in words is "twenty-one trillion, five hundred fifty billion, three hundred forty-three million, two hundred twelve thousand, fifty-five".