2105649142123 has 4 divisors (see below), whose sum is σ = 2197199104848. Its totient is φ = 2014099179400.

The previous prime is 2105649142087. The next prime is 2105649142133. The reversal of 2105649142123 is 3212419465012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2105649142123 - 2²¹ = 2105647044971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105649142133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45774981328 + ... + 45774981373.

It is an arithmetic number, because the mean of its divisors is an integer number (549299776212).

Almost surely, 2^{2105649142123} is an apocalyptic number.

2105649142123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2105649142123 is a deficient number, since it is larger than the sum of its proper divisors (91549962725).

2105649142123 is an equidigital number, since it uses as much as digits as its factorization.

2105649142123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91549962724.

The product of its (nonzero) digits is 103680, while the sum is 40.

The spelling of 2105649142123 in words is "two trillion, one hundred five billion, six hundred forty-nine million, one hundred forty-two thousand, one hundred twenty-three".