888641021 has 2 divisors, whose sum is σ = 888641022. Its totient is φ = 888641020.

The previous prime is 888640981. The next prime is 888641057. The reversal of 888641021 is 120146888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 866419225 + 22221796 = 29435^2 + 4714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-888641021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (888641821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444320510 + 444320511.

It is an arithmetic number, because the mean of its divisors is an integer number (444320511).

Almost surely, 2^888641021 is an apocalyptic number.

It is an amenable number.

888641021 is a deficient number, since it is larger than the sum of its proper divisors (1).

888641021 is an equidigital number, since it uses as much as digits as its factorization.

888641021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 888641021 is about 29810.0825393020. The cubic root of 888641021 is about 961.4103333908.

The spelling of 888641021 in words is "eight hundred eighty-eight million, six hundred forty-one thousand, twenty-one".