2108821317550 has 12 divisors (see below), whose sum is σ = 3922407650736. Its totient is φ = 843528527000.

The previous prime is 2108821317509. The next prime is 2108821317557. The reversal of 2108821317550 is 557131288012.

It is a junction number, because it is equal to n+sod(n) for n = 2108821317497 and 2108821317506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108821317557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21088213126 + ... + 21088213225.

It is an arithmetic number, because the mean of its divisors is an integer number (326867304228).

Almost surely, 2^{2108821317550} is an apocalyptic number.

2108821317550 is a deficient number, since it is larger than the sum of its proper divisors (1813586333186).

2108821317550 is a wasteful number, since it uses less digits than its factorization.

2108821317550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42176426363 (or 42176426358 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The spelling of 2108821317550 in words is "two trillion, one hundred eight billion, eight hundred twenty-one million, three hundred seventeen thousand, five hundred fifty".