2555050021 has 2 divisors, whose sum is σ = 2555050022. Its totient is φ = 2555050020.

The previous prime is 2555049979. The next prime is 2555050027. The reversal of 2555050021 is 1200505552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2528681796 + 26368225 = 50286^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2555050021 - 2⁹ = 2555049509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2555050027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1277525010 + 1277525011.

It is an arithmetic number, because the mean of its divisors is an integer number (1277525011).

Almost surely, 2^2555050021 is an apocalyptic number.

It is an amenable number.

2555050021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2555050021 is an equidigital number, since it uses as much as digits as its factorization.

2555050021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 2555050021 is about 50547.5026188238. The cubic root of 2555050021 is about 1367.0984858407.

Adding to 2555050021 its reverse (1200505552), we get a palindrome (3755555573).

The spelling of 2555050021 in words is "two billion, five hundred fifty-five million, fifty thousand, twenty-one".