5515522021 has 8 divisors (see below), whose sum is σ = 5542002720. Its totient is φ = 5489062608.

The previous prime is 5515521997. The next prime is 5515522037. The reversal of 5515522021 is 1202255155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5515522021 - 2¹¹ = 5515519973 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 (5515522921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790470 + ... + 797416.

It is an arithmetic number, because the mean of its divisors is an integer number (692750340).

Almost surely, 2^5515522021 is an apocalyptic number.

It is an amenable number.

5515522021 is a deficient number, since it is larger than the sum of its proper divisors (26480699).

5515522021 is a wasteful number, since it uses less digits than its factorization.

5515522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 5515522021 is about 74266.5605841552. The cubic root of 5515522021 is about 1766.8331577084.

Adding to 5515522021 its reverse (1202255155), we get a palindrome (6717777176).

The spelling of 5515522021 in words is "five billion, five hundred fifteen million, five hundred twenty-two thousand, twenty-one".