2521222813 has 4 divisors (see below), whose sum is σ = 2521375740. Its totient is φ = 2521069888.

The previous prime is 2521222811. The next prime is 2521222853. The reversal of 2521222813 is 3182221252.

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 1648197604 + 873025209 = 40598^2 + 29547^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521222813 - 2¹ = 2521222811 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 (2521222811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48268 + ... + 85861.

It is an arithmetic number, because the mean of its divisors is an integer number (630343935).

Almost surely, 2^2521222813 is an apocalyptic number.

It is an amenable number.

2521222813 is a deficient number, since it is larger than the sum of its proper divisors (152927).

2521222813 is a wasteful number, since it uses less digits than its factorization.

2521222813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152926.

The product of its digits is 3840, while the sum is 28.

The square root of 2521222813 is about 50211.7796239090. The cubic root of 2521222813 is about 1361.0384969180.

The spelling of 2521222813 in words is "two billion, five hundred twenty-one million, two hundred twenty-two thousand, eight hundred thirteen".