5551021121 has 4 divisors (see below), whose sum is σ = 5553049044. Its totient is φ = 5548993200.

The previous prime is 5551021013. The next prime is 5551021123. The reversal of 5551021121 is 1211201555.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 572166400 + 4978854721 = 23920^2 + 70561^2 .

It is a cyclic number.

It is not a de Polignac number, because 5551021121 - 2¹⁴ = 5551004737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5551021123) 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 3 ways as a sum of consecutive naturals, for example, 1009850 + ... + 1015331.

It is an arithmetic number, because the mean of its divisors is an integer number (1388262261).

Almost surely, 2^5551021121 is an apocalyptic number.

It is an amenable number.

5551021121 is a deficient number, since it is larger than the sum of its proper divisors (2027923).

5551021121 is a wasteful number, since it uses less digits than its factorization.

5551021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027922.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 5551021121 is about 74505.1751289801. The cubic root of 5551021121 is about 1770.6156285746.

Adding to 5551021121 its reverse (1211201555), we get a palindrome (6762222676).

The spelling of 5551021121 in words is "five billion, five hundred fifty-one million, twenty-one thousand, one hundred twenty-one".