2553998021 has 2 divisors, whose sum is σ = 2553998022. Its totient is φ = 2553998020.

The previous prime is 2553998003. The next prime is 2553998033. The reversal of 2553998021 is 1208993552.

2553998021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2538748996 + 15249025 = 50386^2 + 3905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2553998021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2553998921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1276999010 + 1276999011.

It is an arithmetic number, because the mean of its divisors is an integer number (1276999011).

Almost surely, 2^2553998021 is an apocalyptic number.

It is an amenable number.

2553998021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2553998021 is an equidigital number, since it uses as much as digits as its factorization.

2553998021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 2553998021 is about 50537.0954943000. The cubic root of 2553998021 is about 1366.9108332802.

The spelling of 2553998021 in words is "two billion, five hundred fifty-three million, nine hundred ninety-eight thousand, twenty-one".