2505726221 has 4 divisors (see below), whose sum is σ = 2506553244. Its totient is φ = 2504899200.

The previous prime is 2505726199. The next prime is 2505726239. The reversal of 2505726221 is 1226275052.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2191550596 + 314175625 = 46814^2 + 17725^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505726221 - 2¹⁴ = 2505709837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505716221) 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, 408950 + ... + 415031.

It is an arithmetic number, because the mean of its divisors is an integer number (626638311).

Almost surely, 2^2505726221 is an apocalyptic number.

It is an amenable number.

2505726221 is a deficient number, since it is larger than the sum of its proper divisors (827023).

2505726221 is an equidigital number, since it uses as much as digits as its factorization.

2505726221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827022.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 2505726221 is about 50057.2294578915. The cubic root of 2505726221 is about 1358.2442418271.

The spelling of 2505726221 in words is "two billion, five hundred five million, seven hundred twenty-six thousand, two hundred twenty-one".