21000223120012 has 24 divisors (see below), whose sum is σ = 38033056298160. Its totient is φ = 10133929149120.

The previous prime is 21000223119991. The next prime is 21000223120061. The reversal of 21000223120012 is 21002132200012.

It is a happy 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, 36405439 + ... + 36977782.

It is an arithmetic number, because the mean of its divisors is an integer number (1584710679090).

Almost surely, 2^{21000223120012} is an apocalyptic number.

It is an amenable number.

21000223120012 is a deficient number, since it is larger than the sum of its proper divisors (17032833178148).

21000223120012 is a wasteful number, since it uses less digits than its factorization.

21000223120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73385721 (or 73385719 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21000223120012 its reverse (21002132200012), we get a palindrome (42002355320024).

The spelling of 21000223120012 in words is "twenty-one trillion, two hundred twenty-three million, one hundred twenty thousand, twelve".