21120020212012 has 6 divisors (see below), whose sum is σ = 36960035371028. Its totient is φ = 10560010106004.

The previous prime is 21120020212009. The next prime is 21120020212033. The reversal of 21120020212012 is 21021202002112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640002526498 + ... + 2640002526505.

Almost surely, 2^{21120020212012} is an apocalyptic number.

It is an amenable number.

21120020212012 is a deficient number, since it is larger than the sum of its proper divisors (15840015159016).

21120020212012 is a wasteful number, since it uses less digits than its factorization.

21120020212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280005053007 (or 5280005053005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21120020212012 its reverse (21021202002112), we get a palindrome (42141222214124).

The spelling of 21120020212012 in words is "twenty-one trillion, one hundred twenty billion, twenty million, two hundred twelve thousand, twelve".