21112021100012 has 12 divisors (see below), whose sum is σ = 37805247086376. Its totient is φ = 10310521932480.

The previous prime is 21112021100011. The next prime is 21112021100039. The reversal of 21112021100012 is 21000112021112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112021100012.

It is not an unprimeable number, because it can be changed into a prime (21112021100011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61372154189 + ... + 61372154532.

It is an arithmetic number, because the mean of its divisors is an integer number (3150437257198).

Almost surely, 2^{21112021100012} is an apocalyptic number.

It is an amenable number.

21112021100012 is a deficient number, since it is larger than the sum of its proper divisors (16693225986364).

21112021100012 is a wasteful number, since it uses less digits than its factorization.

21112021100012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122744308768 (or 122744308766 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21112021100012 its reverse (21000112021112), we get a palindrome (42112133121124).

The spelling of 21112021100012 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, one hundred thousand, twelve".