21120020001012 has 24 divisors (see below), whose sum is σ = 49327844997312. Its totient is φ = 7033178334400.

The previous prime is 21120020000939. The next prime is 21120020001029. The reversal of 21120020001012 is 21010002002112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853528689 + ... + 853553432.

It is an arithmetic number, because the mean of its divisors is an integer number (2055326874888).

Almost surely, 2^{21120020001012} is an apocalyptic number.

It is an amenable number.

21120020001012 is an abundant number, since it is smaller than the sum of its proper divisors (28207824996300).

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

21120020001012 is a wasteful number, since it uses less digits than its factorization.

21120020001012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707083159 (or 1707083157 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120020001012 its reverse (21010002002112), we get a palindrome (42130022003124).

The spelling of 21120020001012 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one thousand, twelve".