21121102002212 has 48 divisors (see below), whose sum is σ = 39476402567280. Its totient is φ = 9853223657472.

The previous prime is 21121102002199. The next prime is 21121102002257. The reversal of 21121102002212 is 21220020112112.

It can be written as a sum of positive squares in 8 ways, for example, as 34123695076 + 21086978307136 = 184726^2 + 4592056^2 .

It is a super-2 number, since 2×21121102002212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 15 ways as a sum of consecutive naturals, for example, 2338214 + ... + 6907202.

It is an arithmetic number, because the mean of its divisors is an integer number (822425053485).

Almost surely, 2^{21121102002212} is an apocalyptic number.

It is an amenable number.

21121102002212 is a deficient number, since it is larger than the sum of its proper divisors (18355300565068).

21121102002212 is a wasteful number, since it uses less digits than its factorization.

21121102002212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569600 (or 4569598 counting only the distinct ones).

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

Adding to 21121102002212 its reverse (21220020112112), we get a palindrome (42341122114324).

The spelling of 21121102002212 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, two thousand, two hundred twelve".