2617864021 has 2 divisors, whose sum is σ = 2617864022. Its totient is φ = 2617864020.

The previous prime is 2617864019. The next prime is 2617864027. The reversal of 2617864021 is 1204687162.

2617864021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2172864996 + 444999025 = 46614^2 + 21095^2 .

It is a cyclic number.

It is not a de Polignac number, because 2617864021 - 2¹ = 2617864019 is a prime.

Together with 2617864019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2617864027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1308932010 + 1308932011.

It is an arithmetic number, because the mean of its divisors is an integer number (1308932011).

Almost surely, 2^2617864021 is an apocalyptic number.

It is an amenable number.

2617864021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2617864021 is an equidigital number, since it uses as much as digits as its factorization.

2617864021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 2617864021 is about 51165.0664125436. The cubic root of 2617864021 is about 1378.2109458389.

The spelling of 2617864021 in words is "two billion, six hundred seventeen million, eight hundred sixty-four thousand, twenty-one".