21121112110012 has 24 divisors (see below), whose sum is σ = 37119314664432. Its totient is φ = 10515616560000.

The previous prime is 21121112110009. The next prime is 21121112110057. The reversal of 21121112110012 is 21001121112112.

It is a super-2 number, since 2×21121112110012² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823962 + ... + 6551422.

It is an arithmetic number, because the mean of its divisors is an integer number (1546638111018).

Almost surely, 2^{21121112110012} is an apocalyptic number.

It is an amenable number.

21121112110012 is a deficient number, since it is larger than the sum of its proper divisors (15998202554420).

21121112110012 is a wasteful number, since it uses less digits than its factorization.

21121112110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5731389 (or 5731387 counting only the distinct ones).

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

Adding to 21121112110012 its reverse (21001121112112), we get a palindrome (42122233222124).

The spelling of 21121112110012 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, one hundred ten thousand, twelve".