2105521025 has 12 divisors (see below), whose sum is σ = 2611416192. Its totient is φ = 1684049040.

The previous prime is 2105521013. The next prime is 2105521037. The reversal of 2105521025 is 5201255012.

It is an interprime number because it is at equal distance from previous prime (2105521013) and next prime (2105521037).

It is not a de Polignac number, because 2105521025 - 2³⁰ = 1031779201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210692 + ... + 220458.

It is an arithmetic number, because the mean of its divisors is an integer number (217618016).

Almost surely, 2^2105521025 is an apocalyptic number.

2105521025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2105521025 is a deficient number, since it is larger than the sum of its proper divisors (505895167).

2105521025 is an equidigital number, since it uses as much as digits as its factorization.

2105521025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18400 (or 18395 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 2105521025 is about 45885.9567297011. The cubic root of 2105521025 is about 1281.7004225598.

Adding to 2105521025 its reverse (5201255012), we get a palindrome (7306776037).

The spelling of 2105521025 in words is "two billion, one hundred five million, five hundred twenty-one thousand, twenty-five".