5621127921 has 30 divisors (see below), whose sum is σ = 8608415046. Its totient is φ = 3653208000.

The previous prime is 5621127893. The next prime is 5621127923. The reversal of 5621127921 is 1297211265.

5621127921 is a `hidden beast` number, since 5 + 621 + 1 + 2 + 7 + 9 + 21 = 666.

5621127921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1980695025 + 3640432896 = 44505^2 + 60336^2 .

It is not a de Polignac number, because 5621127921 - 2¹⁰ = 5621126897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5621127923) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4319971 + ... + 4321271.

Almost surely, 2^5621127921 is an apocalyptic number.

It is an amenable number.

5621127921 is a deficient number, since it is larger than the sum of its proper divisors (2987287125).

5621127921 is an frugal number, since it uses more digits than its factorization.

5621127921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 1345 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 5621127921 is about 74974.1816961012. The cubic root of 5621127921 is about 1778.0384823699.

The spelling of 5621127921 in words is "five billion, six hundred twenty-one million, one hundred twenty-seven thousand, nine hundred twenty-one".