5577621721 has 32 divisors (see below), whose sum is σ = 6682211840. Its totient is φ = 4556238336.

The previous prime is 5577621691. The next prime is 5577621737. The reversal of 5577621721 is 1271267755.

It is a cyclic number.

It is not a de Polignac number, because 5577621721 - 2⁵ = 5577621689 is a prime.

It is a super-2 number, since 2×5577621721² = 62219728125142003682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5577621761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2967460 + ... + 2969338.

It is an arithmetic number, because the mean of its divisors is an integer number (208819120).

Almost surely, 2^5577621721 is an apocalyptic number.

It is an amenable number.

5577621721 is a deficient number, since it is larger than the sum of its proper divisors (1104590119).

5577621721 is a wasteful number, since it uses less digits than its factorization.

5577621721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153.

The product of its digits is 205800, while the sum is 43.

The square root of 5577621721 is about 74683.4768941564. The cubic root of 5577621721 is about 1773.4393975661.

The spelling of 5577621721 in words is "five billion, five hundred seventy-seven million, six hundred twenty-one thousand, seven hundred twenty-one".