2551155221 has 8 divisors (see below), whose sum is σ = 2595213600. Its totient is φ = 2507124240.

The previous prime is 2551155197. The next prime is 2551155223. The reversal of 2551155221 is 1225511552.

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 2551155221 - 2⁶ = 2551155157 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 (2551155223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291335 + ... + 299963.

It is an arithmetic number, because the mean of its divisors is an integer number (324401700).

Almost surely, 2^2551155221 is an apocalyptic number.

It is an amenable number.

2551155221 is a deficient number, since it is larger than the sum of its proper divisors (44058379).

2551155221 is an equidigital number, since it uses as much as digits as its factorization.

2551155221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13699.

The product of its digits is 5000, while the sum is 29.

The square root of 2551155221 is about 50508.9617889736. The cubic root of 2551155221 is about 1366.4034853587.

Adding to 2551155221 its reverse (1225511552), we get a palindrome (3776666773).

The spelling of 2551155221 in words is "two billion, five hundred fifty-one million, one hundred fifty-five thousand, two hundred twenty-one".