2526530021 has 4 divisors (see below), whose sum is σ = 2675149452. Its totient is φ = 2377910592.

The previous prime is 2526530011. The next prime is 2526530029. The reversal of 2526530021 is 1200356252.

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 909685921 + 1616844100 = 30161^2 + 40210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2526530021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2526530029) 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, 74309690 + ... + 74309723.

It is an arithmetic number, because the mean of its divisors is an integer number (668787363).

Almost surely, 2^2526530021 is an apocalyptic number.

It is an amenable number.

2526530021 is a deficient number, since it is larger than the sum of its proper divisors (148619431).

2526530021 is a wasteful number, since it uses less digits than its factorization.

2526530021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148619430.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 2526530021 is about 50264.6000779873. The cubic root of 2526530021 is about 1361.9928290632.

Adding to 2526530021 its reverse (1200356252), we get a palindrome (3726886273).

The spelling of 2526530021 in words is "two billion, five hundred twenty-six million, five hundred thirty thousand, twenty-one".