2587042721 has 4 divisors (see below), whose sum is σ = 2670495744. Its totient is φ = 2503589700.

The previous prime is 2587042699. The next prime is 2587042739. The reversal of 2587042721 is 1272407852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2587042721 - 2³⁰ = 1513300897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2587042741) 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, 41726465 + ... + 41726526.

It is an arithmetic number, because the mean of its divisors is an integer number (667623936).

Almost surely, 2^2587042721 is an apocalyptic number.

It is an amenable number.

2587042721 is a deficient number, since it is larger than the sum of its proper divisors (83453023).

2587042721 is an equidigital number, since it uses as much as digits as its factorization.

2587042721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83453022.

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 2587042721 is about 50862.9798674832. The cubic root of 2587042721 is about 1372.7808118383.

The spelling of 2587042721 in words is "two billion, five hundred eighty-seven million, forty-two thousand, seven hundred twenty-one".