550055000021 has 6 divisors (see below), whose sum is σ = 580528961622. Its totient is φ = 521104736520.

The previous prime is 550054999999. The next prime is 550055000039. The reversal of 550055000021 is 120000550055.

It can be written as a sum of positive squares in only one way, i.e., 317042194225 + 233012805796 = 563065^2 + 482714^2 .

It is not a de Polignac number, because 550055000021 - 2⁶ = 550054999957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550055006021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 761848670 + ... + 761849391.

It is an arithmetic number, because the mean of its divisors is an integer number (96754826937).

Almost surely, 2^550055000021 is an apocalyptic number.

It is an amenable number.

550055000021 is a deficient number, since it is larger than the sum of its proper divisors (30473961601).

550055000021 is a wasteful number, since it uses less digits than its factorization.

550055000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523698099 (or 1523698080 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 23.

Adding to 550055000021 its reverse (120000550055), we get a palindrome (670055550076).

The spelling of 550055000021 in words is "five hundred fifty billion, fifty-five million, twenty-one", and thus it is an aban number.