2255000021 has 2 divisors, whose sum is σ = 2255000022. Its totient is φ = 2255000020.

The previous prime is 2254999963. The next prime is 2255000029. The reversal of 2255000021 is 1200005522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1228502500 + 1026497521 = 35050^2 + 32039^2 .

It is a cyclic number.

It is not a de Polignac number, because 2255000021 - 2¹⁴ = 2254983637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2255000029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1127500010 + 1127500011.

It is an arithmetic number, because the mean of its divisors is an integer number (1127500011).

Almost surely, 2^2255000021 is an apocalyptic number.

It is an amenable number.

2255000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2255000021 is an equidigital number, since it uses as much as digits as its factorization.

2255000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 2255000021 is about 47486.8405034490. The cubic root of 2255000021 is about 1311.3406280260.

Adding to 2255000021 its reverse (1200005522), we get a palindrome (3455005543).

The spelling of 2255000021 in words is "two billion, two hundred fifty-five million, twenty-one", and thus it is an aban number.