5555120021 has 16 divisors (see below), whose sum is σ = 6213300480. Its totient is φ = 4923310080.

The previous prime is 5555119987. The next prime is 5555120071. The reversal of 5555120021 is 1200215555.

It is a cyclic number.

It is not a de Polignac number, because 5555120021 - 2⁶ = 5555119957 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 (5555120071) 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, 111965 + ... + 153773.

It is an arithmetic number, because the mean of its divisors is an integer number (388331280).

Almost surely, 2^5555120021 is an apocalyptic number.

It is an amenable number.

5555120021 is a deficient number, since it is larger than the sum of its proper divisors (658180459).

5555120021 is a wasteful number, since it uses less digits than its factorization.

5555120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42124.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 5555120021 is about 74532.6775381108. The cubic root of 5555120021 is about 1771.0513316421.

Adding to 5555120021 its reverse (1200215555), we get a palindrome (6755335576).

The spelling of 5555120021 in words is "five billion, five hundred fifty-five million, one hundred twenty thousand, twenty-one".