2551143221 has 8 divisors (see below), whose sum is σ = 2842280064. Its totient is φ = 2269875520.

The previous prime is 2551143211. The next prime is 2551143223. The reversal of 2551143221 is 1223411552.

2551143221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2551143221 - 2⁶ = 2551143157 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 (2551143223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2466740 + ... + 2467773.

It is an arithmetic number, because the mean of its divisors is an integer number (355285008).

Almost surely, 2^2551143221 is an apocalyptic number.

It is an amenable number.

2551143221 is a deficient number, since it is larger than the sum of its proper divisors (291136843).

2551143221 is a wasteful number, since it uses less digits than its factorization.

2551143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4934571.

The product of its digits is 2400, while the sum is 26.

The square root of 2551143221 is about 50508.8429980335. The cubic root of 2551143221 is about 1366.4013429479.

Adding to 2551143221 its reverse (1223411552), we get a palindrome (3774554773).

The spelling of 2551143221 in words is "two billion, five hundred fifty-one million, one hundred forty-three thousand, two hundred twenty-one".