2100205661061 has 16 divisors (see below), whose sum is σ = 2846238666368. Its totient is φ = 1377155822400.

The previous prime is 2100205661039. The next prime is 2100205661069. The reversal of 2100205661061 is 1601665020012.

It is not a de Polignac number, because 2100205661061 - 2¹⁰ = 2100205660037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100205661069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12567231 + ... + 12733251.

It is an arithmetic number, because the mean of its divisors is an integer number (177889916648).

Almost surely, 2^{2100205661061} is an apocalyptic number.

It is an amenable number.

2100205661061 is a deficient number, since it is larger than the sum of its proper divisors (746033005307).

2100205661061 is a wasteful number, since it uses less digits than its factorization.

2100205661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235212.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 2100205661061 in words is "two trillion, one hundred billion, two hundred five million, six hundred sixty-one thousand, sixty-one".