2521213631 has 8 divisors (see below), whose sum is σ = 2566846128. Its totient is φ = 2475720000.

The previous prime is 2521213613. The next prime is 2521213637. The reversal of 2521213631 is 1363121252.

It is a happy number.

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 2521213631 - 2¹⁴ = 2521197247 is a prime.

It is a super-2 number, since 2×2521213631² = 12713036346280408322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2521213631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521213637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2276 + ... + 71046.

It is an arithmetic number, because the mean of its divisors is an integer number (320855766).

Almost surely, 2^2521213631 is an apocalyptic number.

2521213631 is a deficient number, since it is larger than the sum of its proper divisors (45632497).

2521213631 is an equidigital number, since it uses as much as digits as its factorization.

2521213631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69433.

The product of its digits is 2160, while the sum is 26.

The square root of 2521213631 is about 50211.6881910975. The cubic root of 2521213631 is about 1361.0368446681.

Adding to 2521213631 its reverse (1363121252), we get a palindrome (3884334883).

The spelling of 2521213631 in words is "two billion, five hundred twenty-one million, two hundred thirteen thousand, six hundred thirty-one".