844525021 has 2 divisors, whose sum is σ = 844525022. Its totient is φ = 844525020.

The previous prime is 844525007. The next prime is 844525051. The reversal of 844525021 is 120525448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 843902500 + 622521 = 29050^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 844525021 - 2¹⁹ = 844000733 is a prime.

It is a super-2 number, since 2×844525021² = 1426445022190100882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (844525051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422262510 + 422262511.

It is an arithmetic number, because the mean of its divisors is an integer number (422262511).

Almost surely, 2^844525021 is an apocalyptic number.

It is an amenable number.

844525021 is a deficient number, since it is larger than the sum of its proper divisors (1).

844525021 is an equidigital number, since it uses as much as digits as its factorization.

844525021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12800, while the sum is 31.

The square root of 844525021 is about 29060.7126719219. The cubic root of 844525021 is about 945.2300219246.

The spelling of 844525021 in words is "eight hundred forty-four million, five hundred twenty-five thousand, twenty-one".