985332100021 has 2 divisors, whose sum is σ = 985332100022. Its totient is φ = 985332100020.

The previous prime is 985332099959. The next prime is 985332100031. The reversal of 985332100021 is 120001233589.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 985155502500 + 176597521 = 992550^2 + 13289^2 .

It is an emirp because it is prime and its reverse (120001233589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985332100021 - 2¹³ = 985332091829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 985332100021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985332100031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492666050010 + 492666050011.

It is an arithmetic number, because the mean of its divisors is an integer number (492666050011).

Almost surely, 2^985332100021 is an apocalyptic number.

It is an amenable number.

985332100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

985332100021 is an equidigital number, since it uses as much as digits as its factorization.

985332100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 985332100021 in words is "nine hundred eighty-five billion, three hundred thirty-two million, one hundred thousand, twenty-one".