2421521251 has 4 divisors (see below), whose sum is σ = 2428707112. Its totient is φ = 2414335392.

The previous prime is 2421521239. The next prime is 2421521261. The reversal of 2421521251 is 1521251242.

2421521251 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 2421521251 - 2²¹ = 2419424099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421521261) 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, 3592425 + ... + 3593098.

It is an arithmetic number, because the mean of its divisors is an integer number (607176778).

Almost surely, 2^2421521251 is an apocalyptic number.

2421521251 is a deficient number, since it is larger than the sum of its proper divisors (7185861).

2421521251 is an equidigital number, since it uses as much as digits as its factorization.

2421521251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7185860.

The product of its digits is 1600, while the sum is 25.

The square root of 2421521251 is about 49208.9549878881. The cubic root of 2421521251 is about 1342.8559513522.

Adding to 2421521251 its reverse (1521251242), we get a palindrome (3942772493).

The spelling of 2421521251 in words is "two billion, four hundred twenty-one million, five hundred twenty-one thousand, two hundred fifty-one".