2516551421 has 2 divisors, whose sum is σ = 2516551422. Its totient is φ = 2516551420.

The previous prime is 2516551403. The next prime is 2516551439. The reversal of 2516551421 is 1241556152.

It is a balanced prime because it is at equal distance from previous prime (2516551403) and next prime (2516551439).

It can be written as a sum of positive squares in only one way, i.e., 1880956900 + 635594521 = 43370^2 + 25211^2 .

It is a cyclic number.

It is not a de Polignac number, because 2516551421 - 2²² = 2512357117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2516551441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258275710 + 1258275711.

It is an arithmetic number, because the mean of its divisors is an integer number (1258275711).

Almost surely, 2^2516551421 is an apocalyptic number.

It is an amenable number.

2516551421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516551421 is an equidigital number, since it uses as much as digits as its factorization.

2516551421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12000, while the sum is 32.

The square root of 2516551421 is about 50165.2411635786. The cubic root of 2516551421 is about 1360.1973871880.

The spelling of 2516551421 in words is "two billion, five hundred sixteen million, five hundred fifty-one thousand, four hundred twenty-one".