21012121001112 has 64 divisors (see below), whose sum is σ = 52865264342880. Its totient is φ = 6959470758912.

The previous prime is 21012121001077. The next prime is 21012121001119. The reversal of 21012121001112 is 21110012121012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012121001091 and 21012121001100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012121001119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780108 + ... + 6529380.

Almost surely, 2^{21012121001112} is an apocalyptic number.

It is an amenable number.

21012121001112 is an abundant number, since it is smaller than the sum of its proper divisors (31853143341768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012121001112 is a wasteful number, since it uses less digits than its factorization.

21012121001112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5750252 (or 5750248 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21012121001112 its reverse (21110012121012), we get a palindrome (42122133122124).

The spelling of 21012121001112 in words is "twenty-one trillion, twelve billion, one hundred twenty-one million, one thousand, one hundred twelve".