5621163521 has 4 divisors (see below), whose sum is σ = 5705061552. Its totient is φ = 5537265492.

The previous prime is 5621163511. The next prime is 5621163533. The reversal of 5621163521 is 1253611265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5621163521 is a prime.

It is a super-2 number, since 2×5621163521² = 63194958659642234882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5621163511) 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, 41948915 + ... + 41949048.

It is an arithmetic number, because the mean of its divisors is an integer number (1426265388).

Almost surely, 2^5621163521 is an apocalyptic number.

It is an amenable number.

5621163521 is a deficient number, since it is larger than the sum of its proper divisors (83898031).

5621163521 is an equidigital number, since it uses as much as digits as its factorization.

5621163521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83898030.

The product of its digits is 10800, while the sum is 32.

The square root of 5621163521 is about 74974.4191107874. The cubic root of 5621163521 is about 1778.0422359485.

Adding to 5621163521 its reverse (1253611265), we get a palindrome (6874774786).

The spelling of 5621163521 in words is "five billion, six hundred twenty-one million, one hundred sixty-three thousand, five hundred twenty-one".