2105206553 has 4 divisors (see below), whose sum is σ = 2140888080. Its totient is φ = 2069525028.

The previous prime is 2105206511. The next prime is 2105206573. The reversal of 2105206553 is 3556025012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2105206553 - 2¹² = 2105202457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2105206573) 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, 17840675 + ... + 17840792.

It is an arithmetic number, because the mean of its divisors is an integer number (535222020).

Almost surely, 2^2105206553 is an apocalyptic number.

It is an amenable number.

2105206553 is a deficient number, since it is larger than the sum of its proper divisors (35681527).

2105206553 is an equidigital number, since it uses as much as digits as its factorization.

2105206553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35681526.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 2105206553 is about 45882.5299324264. The cubic root of 2105206553 is about 1281.6366095401.

The spelling of 2105206553 in words is "two billion, one hundred five million, two hundred six thousand, five hundred fifty-three".