2551265021 has 8 divisors (see below), whose sum is σ = 2702307384. Its totient is φ = 2400330240.

The previous prime is 2551264999. The next prime is 2551265023. The reversal of 2551265021 is 1205621552.

2551265021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1899739396 + 651525625 = 43586^2 + 25525^2 .

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 2551265021 - 2¹⁸ = 2551002877 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 (2551265023) 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, 24791 + ... + 75611.

It is an arithmetic number, because the mean of its divisors is an integer number (337788423).

Almost surely, 2^2551265021 is an apocalyptic number.

It is an amenable number.

2551265021 is a deficient number, since it is larger than the sum of its proper divisors (151042363).

2551265021 is a wasteful number, since it uses less digits than its factorization.

2551265021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53791.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 2551265021 is about 50510.0487131026. The cubic root of 2551265021 is about 1366.4230881056.

Adding to 2551265021 its reverse (1205621552), we get a palindrome (3756886573).

The spelling of 2551265021 in words is "two billion, five hundred fifty-one million, two hundred sixty-five thousand, twenty-one".