971021 has 2 divisors, whose sum is σ = 971022. Its totient is φ = 971020.

The previous prime is 970999. The next prime is 971027. The reversal of 971021 is 120179.

971021 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., 624100 + 346921 = 790^2 + 589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 970984 and 971002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485510 + 485511.

It is an arithmetic number, because the mean of its divisors is an integer number (485511).

2⁹⁷¹⁰²¹ is an apocalyptic number.

It is an amenable number.

971021 is a deficient number, since it is larger than the sum of its proper divisors (1).

971021 is an equidigital number, since it uses as much as digits as its factorization.

971021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 971021 is about 985.4039780719. The cubic root of 971021 is about 99.0245492295.

The spelling of 971021 in words is "nine hundred seventy-one thousand, twenty-one".