21210330021112 has 8 divisors (see below), whose sum is σ = 39769368789600. Its totient is φ = 10605165010552.

The previous prime is 21210330021077. The next prime is 21210330021113. The reversal of 21210330021112 is 21112003301212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21210330021112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210330021113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325645626312 + ... + 1325645626327.

It is an arithmetic number, because the mean of its divisors is an integer number (4971171098700).

Almost surely, 2^{21210330021112} is an apocalyptic number.

It is an amenable number.

21210330021112 is a deficient number, since it is larger than the sum of its proper divisors (18559038768488).

21210330021112 is a wasteful number, since it uses less digits than its factorization.

21210330021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651291252645 (or 2651291252641 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21210330021112 its reverse (21112003301212), we get a palindrome (42322333322324).

The spelling of 21210330021112 in words is "twenty-one trillion, two hundred ten billion, three hundred thirty million, twenty-one thousand, one hundred twelve".