2521213445 has 8 divisors (see below), whose sum is σ = 3082540536. Its totient is φ = 1978914496.

The previous prime is 2521213439. The next prime is 2521213511. The reversal of 2521213445 is 5443121252.

It can be written as a sum of positive squares in 4 ways, for example, as 25411681 + 2495801764 = 5041^2 + 49958^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2521213445 - 2²⁰ = 2520164869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4756742 + ... + 4757271.

It is an arithmetic number, because the mean of its divisors is an integer number (385317567).

Almost surely, 2^2521213445 is an apocalyptic number.

It is an amenable number.

2521213445 is a deficient number, since it is larger than the sum of its proper divisors (561327091).

2521213445 is an equidigital number, since it uses as much as digits as its factorization.

2521213445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9514071.

The product of its digits is 9600, while the sum is 29.

The square root of 2521213445 is about 50211.6863389391. The cubic root of 2521213445 is about 1361.0368111984.

Adding to 2521213445 its reverse (5443121252), we get a palindrome (7964334697).

The spelling of 2521213445 in words is "two billion, five hundred twenty-one million, two hundred thirteen thousand, four hundred forty-five".