21012021102112 has 48 divisors (see below), whose sum is σ = 41695249720320. Its totient is φ = 10422759691008.

The previous prime is 21012021102109. The next prime is 21012021102119. The reversal of 21012021102112 is 21120112021012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21012021102119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87609814 + ... + 87849322.

It is an arithmetic number, because the mean of its divisors is an integer number (868651035840).

Almost surely, 2^{21012021102112} is an apocalyptic number.

It is an amenable number.

21012021102112 is a deficient number, since it is larger than the sum of its proper divisors (20683228618208).

21012021102112 is a wasteful number, since it uses less digits than its factorization.

21012021102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261233 (or 261225 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012021102112 its reverse (21120112021012), we get a palindrome (42132133123124).

The spelling of 21012021102112 in words is "twenty-one trillion, twelve billion, twenty-one million, one hundred two thousand, one hundred twelve".