5551552121 has 4 divisors (see below), whose sum is σ = 5552012544. Its totient is φ = 5551091700.

The previous prime is 5551552091. The next prime is 5551552133. The reversal of 5551552121 is 1212551555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1212551555 = 5 ⋅242510311.

It is a cyclic number.

It is not a de Polignac number, because 5551552121 - 2²² = 5547357817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5551552141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211625 + ... + 236406.

It is an arithmetic number, because the mean of its divisors is an integer number (1388003136).

Almost surely, 2^5551552121 is an apocalyptic number.

It is an amenable number.

5551552121 is a deficient number, since it is larger than the sum of its proper divisors (460423).

5551552121 is a wasteful number, since it uses less digits than its factorization.

5551552121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460422.

The product of its digits is 12500, while the sum is 32.

The square root of 5551552121 is about 74508.7385546152. The cubic root of 5551552121 is about 1770.6720846693.

The spelling of 5551552121 in words is "five billion, five hundred fifty-one million, five hundred fifty-two thousand, one hundred twenty-one".