21110111021012 has 24 divisors (see below), whose sum is σ = 39788543709096. Its totient is φ = 9742123173888.

The previous prime is 21110111021003. The next prime is 21110111021039. The reversal of 21110111021012 is 21012011101112.

It can be written as a sum of positive squares in 4 ways, for example, as 201202485136 + 20908908535876 = 448556^2 + 4572626^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20428193 + ... + 21436680.

It is an arithmetic number, because the mean of its divisors is an integer number (1657855987879).

Almost surely, 2^{21110111021012} is an apocalyptic number.

It is an amenable number.

21110111021012 is a deficient number, since it is larger than the sum of its proper divisors (18678432688084).

21110111021012 is a wasteful number, since it uses less digits than its factorization.

21110111021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41874587 (or 41874585 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21110111021012 its reverse (21012011101112), we get a palindrome (42122122122124).

The spelling of 21110111021012 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, twenty-one thousand, twelve".