5561223621 has 4 divisors (see below), whose sum is σ = 7414964832. Its totient is φ = 3707482412.

The previous prime is 5561223557. The next prime is 5561223623. The reversal of 5561223621 is 1263221655.

5561223621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 5561223621 - 2⁶ = 5561223557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561223623) 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, 926870601 + ... + 926870606.

It is an arithmetic number, because the mean of its divisors is an integer number (1853741208).

Almost surely, 2^5561223621 is an apocalyptic number.

It is an amenable number.

5561223621 is a deficient number, since it is larger than the sum of its proper divisors (1853741211).

5561223621 is a wasteful number, since it uses less digits than its factorization.

5561223621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853741210.

The product of its digits is 21600, while the sum is 33.

The square root of 5561223621 is about 74573.6120957004. The cubic root of 5561223621 is about 1771.6997324119.

The spelling of 5561223621 in words is "five billion, five hundred sixty-one million, two hundred twenty-three thousand, six hundred twenty-one".