21021200089 has 2 divisors, whose sum is σ = 21021200090. Its totient is φ = 21021200088.

The previous prime is 21021200041. The next prime is 21021200141. The reversal of 21021200089 is 98000212012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10712250000 + 10308950089 = 103500^2 + 101533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021200089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021200989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510600044 + 10510600045.

It is an arithmetic number, because the mean of its divisors is an integer number (10510600045).

Almost surely, 2^21021200089 is an apocalyptic number.

It is an amenable number.

21021200089 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021200089 is an equidigital number, since it uses as much as digits as its factorization.

21021200089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The spelling of 21021200089 in words is "twenty-one billion, twenty-one million, two hundred thousand, eighty-nine".