5621611021 has 16 divisors (see below), whose sum is σ = 6418252288. Its totient is φ = 4886049600.

The previous prime is 5621611019. The next prime is 5621611027. The reversal of 5621611021 is 1201161265.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5621611021 - 2¹ = 5621611019 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 (5621611027) 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 15 ways as a sum of consecutive naturals, for example, 173595 + ... + 203416.

It is an arithmetic number, because the mean of its divisors is an integer number (401140768).

Almost surely, 2^5621611021 is an apocalyptic number.

It is an amenable number.

5621611021 is a deficient number, since it is larger than the sum of its proper divisors (796641267).

5621611021 is a wasteful number, since it uses less digits than its factorization.

5621611021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377092.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 5621611021 is about 74977.4034026252. The cubic root of 5621611021 is about 1778.0894179233.

Adding to 5621611021 its reverse (1201161265), we get a palindrome (6822772286).

The spelling of 5621611021 in words is "five billion, six hundred twenty-one million, six hundred eleven thousand, twenty-one".