2501276721 has 4 divisors (see below), whose sum is σ = 3335035632. Its totient is φ = 1667517812.

The previous prime is 2501276707. The next prime is 2501276741. The reversal of 2501276721 is 1276721052.

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 2501276721 - 2¹¹ = 2501274673 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2501276741) 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, 416879451 + ... + 416879456.

It is an arithmetic number, because the mean of its divisors is an integer number (833758908).

Almost surely, 2^2501276721 is an apocalyptic number.

It is an amenable number.

2501276721 is a deficient number, since it is larger than the sum of its proper divisors (833758911).

2501276721 is an equidigital number, since it uses as much as digits as its factorization.

2501276721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833758910.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 2501276721 is about 50012.7655803996. The cubic root of 2501276721 is about 1357.4398059109.

Adding to 2501276721 its reverse (1276721052), we get a palindrome (3777997773).

The spelling of 2501276721 in words is "two billion, five hundred one million, two hundred seventy-six thousand, seven hundred twenty-one".