21121000212012 has 48 divisors (see below), whose sum is σ = 51817601670912. Its totient is φ = 6682825589440.

The previous prime is 21121000212001. The next prime is 21121000212017. The reversal of 21121000212012 is 21021200012112.

It is a junction number, because it is equal to n+sod(n) for n = 21121000211982 and 21121000212000.

It is not an unprimeable number, because it can be changed into a prime (21121000212017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292045383 + ... + 292117694.

It is an arithmetic number, because the mean of its divisors is an integer number (1079533368144).

Almost surely, 2^{21121000212012} is an apocalyptic number.

It is an amenable number.

21121000212012 is an abundant number, since it is smaller than the sum of its proper divisors (30696601458900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121000212012 is a wasteful number, since it uses less digits than its factorization.

21121000212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584163238 (or 584163236 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21121000212012 its reverse (21021200012112), we get a palindrome (42142200224124).

The spelling of 21121000212012 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twelve thousand, twelve".