2105249999 has 4 divisors (see below), whose sum is σ = 2105341800. Its totient is φ = 2105158200.

The previous prime is 2105249987. The next prime is 2105250031. The reversal of 2105249999 is 9999425012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2105249999 - 2¹² = 2105245903 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 (2105249969) 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, 21077 + ... + 68225.

It is an arithmetic number, because the mean of its divisors is an integer number (526335450).

Almost surely, 2^2105249999 is an apocalyptic number.

2105249999 is a deficient number, since it is larger than the sum of its proper divisors (91801).

2105249999 is an equidigital number, since it uses as much as digits as its factorization.

2105249999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91800.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 2105249999 is about 45883.0033781574. The cubic root of 2105249999 is about 1281.6454260307.

The spelling of 2105249999 in words is "two billion, one hundred five million, two hundred forty-nine thousand, nine hundred ninety-nine".