2105250221540 has 12 divisors (see below), whose sum is σ = 4421025465276. Its totient is φ = 842100088608.

The previous prime is 2105250221537. The next prime is 2105250221561. The reversal of 2105250221540 is 451220525012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1511783366116 + 593466855424 = 1229546^2 + 770368^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52631255519 + ... + 52631255558.

It is an arithmetic number, because the mean of its divisors is an integer number (368418788773).

Almost surely, 2^{2105250221540} is an apocalyptic number.

2105250221540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2105250221540 is an abundant number, since it is smaller than the sum of its proper divisors (2315775243736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2105250221540 is a wasteful number, since it uses less digits than its factorization.

2105250221540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105262511086 (or 105262511084 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 2105250221540 its reverse (451220525012), we get a palindrome (2556470746552).

The spelling of 2105250221540 in words is "two trillion, one hundred five billion, two hundred fifty million, two hundred twenty-one thousand, five hundred forty".