2102040251 has 4 divisors (see below), whose sum is σ = 2150924952. Its totient is φ = 2053155552.

The previous prime is 2102040229. The next prime is 2102040253. The reversal of 2102040251 is 1520402012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102040251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2102040253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24442286 + ... + 24442371.

It is an arithmetic number, because the mean of its divisors is an integer number (537731238).

Almost surely, 2^2102040251 is an apocalyptic number.

2102040251 is a deficient number, since it is larger than the sum of its proper divisors (48884701).

2102040251 is an equidigital number, since it uses as much as digits as its factorization.

2102040251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48884700.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 2102040251 is about 45848.0125087228. The cubic root of 2102040251 is about 1280.9937455043.

Adding to 2102040251 its reverse (1520402012), we get a palindrome (3622442263).

The spelling of 2102040251 in words is "two billion, one hundred two million, forty thousand, two hundred fifty-one".