21012122200985 has 32 divisors (see below), whose sum is σ = 26381864678400. Its totient is φ = 16045091112960.

The previous prime is 21012122200973. The next prime is 21012122200997. The reversal of 21012122200985 is 58900222121012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21012122200973) and next prime (21012122200997).

It is not a de Polignac number, because 21012122200985 - 2¹⁴ = 21012122184601 is a prime.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 11993276 + ... + 13633154.

It is an arithmetic number, because the mean of its divisors is an integer number (824433271200).

Almost surely, 2^{21012122200985} is an apocalyptic number.

It is an amenable number.

21012122200985 is a deficient number, since it is larger than the sum of its proper divisors (5369742477415).

21012122200985 is a wasteful number, since it uses less digits than its factorization.

21012122200985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640921.

The product of its (nonzero) digits is 11520, while the sum is 35.

Adding to 21012122200985 its reverse (58900222121012), we get a palindrome (79912344321997).

The spelling of 21012122200985 in words is "twenty-one trillion, twelve billion, one hundred twenty-two million, two hundred thousand, nine hundred eighty-five".