2101969845550 has 24 divisors (see below), whose sum is σ = 3909847115376. Its totient is φ = 840748539840.

The previous prime is 2101969845541. The next prime is 2101969845551. The reversal of 2101969845550 is 555489691012.

It is a junction number, because it is equal to n+sod(n) for n = 2101969845491 and 2101969845500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101969845551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104679 + ... + 2053021.

It is an arithmetic number, because the mean of its divisors is an integer number (162910296474).

Almost surely, 2^{2101969845550} is an apocalyptic number.

2101969845550 is a deficient number, since it is larger than the sum of its proper divisors (1807877269826).

2101969845550 is a wasteful number, since it uses less digits than its factorization.

2101969845550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969932 (or 1969927 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 2101969845550 in words is "two trillion, one hundred one billion, nine hundred sixty-nine million, eight hundred forty-five thousand, five hundred fifty".