21120002020012 has 18 divisors (see below), whose sum is σ = 42994289826852. Its totient is φ = 9051429437064.

The previous prime is 21120002020009. The next prime is 21120002020021. The reversal of 21120002020012 is 21002020002112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21120002019974 and 21120002020001.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 53877555978 + ... + 53877556369.

Almost surely, 2^{21120002020012} is an apocalyptic number.

It is an amenable number.

21120002020012 is an abundant number, since it is smaller than the sum of its proper divisors (21874287806840).

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

21120002020012 is a wasteful number, since it uses less digits than its factorization.

21120002020012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107755112365 (or 107755112356 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21120002020012 its reverse (21002020002112), we get a palindrome (42122022022124).

The spelling of 21120002020012 in words is "twenty-one trillion, one hundred twenty billion, two million, twenty thousand, twelve".