21210111001012 has 48 divisors (see below), whose sum is σ = 37932512974272. Its totient is φ = 10373470398720.

The previous prime is 21210111001007. The next prime is 21210111001019. The reversal of 21210111001012 is 21010011101212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21210111000983 and 21210111001001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210111001019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640946587 + ... + 640979677.

It is an arithmetic number, because the mean of its divisors is an integer number (790260686964).

Almost surely, 2^{21210111001012} is an apocalyptic number.

It is an amenable number.

21210111001012 is a deficient number, since it is larger than the sum of its proper divisors (16722401973260).

21210111001012 is a wasteful number, since it uses less digits than its factorization.

21210111001012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42208 (or 42206 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210111001012 its reverse (21010011101212), we get a palindrome (42220122102224).

The spelling of 21210111001012 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one thousand, twelve".