2551402021 has 12 divisors (see below), whose sum is σ = 3063699840. Its totient is φ = 2116369080.

The previous prime is 2551402013. The next prime is 2551402031. The reversal of 2551402021 is 1202041552.

It is not a de Polignac number, because 2551402021 - 2³ = 2551402013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2551401983 and 2551402001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551402001) 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 11 ways as a sum of consecutive naturals, for example, 838311 + ... + 841348.

It is an arithmetic number, because the mean of its divisors is an integer number (255308320).

Almost surely, 2^2551402021 is an apocalyptic number.

It is an amenable number.

2551402021 is a deficient number, since it is larger than the sum of its proper divisors (512297819).

2551402021 is a wasteful number, since it uses less digits than its factorization.

2551402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679704 (or 1679697 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2551402021 is about 50511.4048606847. The cubic root of 2551402021 is about 1366.4475461178.

Adding to 2551402021 its reverse (1202041552), we get a palindrome (3753443573).

The spelling of 2551402021 in words is "two billion, five hundred fifty-one million, four hundred two thousand, twenty-one".