21121020202112 has 16 divisors (see below), whose sum is σ = 42077032434150. Its totient is φ = 10560510100992.

The previous prime is 21121020202097. The next prime is 21121020202129. The reversal of 21121020202112 is 21120202012112.

It can be written as a sum of positive squares in only one way, i.e., 13782685950016 + 7338334252096 = 3712504^2 + 2708936^2 .

It is a tau number, because it is divible by the number of its divisors (16).

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 as a sum of consecutive naturals, namely, 82503985037 + ... + 82503985292.

Almost surely, 2^{21121020202112} is an apocalyptic number.

It is an amenable number.

21121020202112 is a deficient number, since it is larger than the sum of its proper divisors (20956012232038).

21121020202112 is an equidigital number, since it uses as much as digits as its factorization.

21121020202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165007970343 (or 165007970331 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21121020202112 its reverse (21120202012112), we get a palindrome (42241222214224).

The spelling of 21121020202112 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred two thousand, one hundred twelve".