880021 has 2 divisors, whose sum is σ = 880022. Its totient is φ = 880020.

The previous prime is 880007. The next prime is 880027. The reversal of 880021 is 120088.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 731025 + 148996 = 855^2 + 386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-880021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (880027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440010 + 440011.

It is an arithmetic number, because the mean of its divisors is an integer number (440011).

2⁸⁸⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

880021 is a deficient number, since it is larger than the sum of its proper divisors (1).

880021 is an equidigital number, since it uses as much as digits as its factorization.

880021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 880021 is about 938.0943449355. The cubic root of 880021 is about 95.8291594065.

The spelling of 880021 in words is "eight hundred eighty thousand, twenty-one".