21121002212 has 48 divisors (see below), whose sum is σ = 40165880832. Its totient is φ = 9688842240.

The previous prime is 21121002211. The next prime is 21121002233. The reversal of 21121002212 is 21220012112.

21121002212 is nontrivially palindromic in base 16.

It is not an unprimeable number, because it can be changed into a prime (21121002211) 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 15 ways as a sum of consecutive naturals, for example, 289508 + ... + 355044.

It is an arithmetic number, because the mean of its divisors is an integer number (836789184).

Almost surely, 2^21121002212 is an apocalyptic number.

It is an amenable number.

21121002212 is a deficient number, since it is larger than the sum of its proper divisors (19044878620).

21121002212 is a wasteful number, since it uses less digits than its factorization.

21121002212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65708 (or 65706 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21121002212 its reverse (21220012112), we get a palindrome (42341014324).

The spelling of 21121002212 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred twelve".