21121001110212 has 24 divisors (see below), whose sum is σ = 49670385816576. Its totient is φ = 6984898004448.

The previous prime is 21121001110211. The next prime is 21121001110271. The reversal of 21121001110212 is 21201110012112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21121001110191 and 21121001110200.

It is not an unprimeable number, because it can be changed into a prime (21121001110211) by changing a digit.

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, 6929460783 + ... + 6929463830.

It is an arithmetic number, because the mean of its divisors is an integer number (2069599409024).

Almost surely, 2^{21121001110212} is an apocalyptic number.

It is an amenable number.

21121001110212 is an abundant number, since it is smaller than the sum of its proper divisors (28549384706364).

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

21121001110212 is a wasteful number, since it uses less digits than its factorization.

21121001110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13858924747 (or 13858924745 counting only the distinct ones).

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

Adding to 21121001110212 its reverse (21201110012112), we get a palindrome (42322111122324).

The spelling of 21121001110212 in words is "twenty-one trillion, one hundred twenty-one billion, one million, one hundred ten thousand, two hundred twelve".