2521442251 has 4 divisors (see below), whose sum is σ = 2521616904. Its totient is φ = 2521267600.

The previous prime is 2521442249. The next prime is 2521442311. The reversal of 2521442251 is 1522441252.

It is a happy number.

2521442251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2521442251 - 2¹ = 2521442249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521442221) 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, 63505 + ... + 95266.

It is an arithmetic number, because the mean of its divisors is an integer number (630404226).

Almost surely, 2^2521442251 is an apocalyptic number.

2521442251 is a deficient number, since it is larger than the sum of its proper divisors (174653).

2521442251 is a wasteful number, since it uses less digits than its factorization.

2521442251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174652.

The product of its digits is 6400, while the sum is 28.

The square root of 2521442251 is about 50213.9647010670. The cubic root of 2521442251 is about 1361.0779823745.

Subtracting from 2521442251 its reverse (1522441252), we obtain a palindrome (999000999).

The spelling of 2521442251 in words is "two billion, five hundred twenty-one million, four hundred forty-two thousand, two hundred fifty-one".