21120211212 has 48 divisors (see below), whose sum is σ = 50774556672. Its totient is φ = 6829285120.

The previous prime is 21120211207. The next prime is 21120211213. The reversal of 21120211212 is 21211202112.

It is a junction number, because it is equal to n+sod(n) for n = 21120211191 and 21120211200.

It is not an unprimeable number, because it can be changed into a prime (21120211213) 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, 101964 + ... + 229427.

It is an arithmetic number, because the mean of its divisors is an integer number (1057803264).

Almost surely, 2^21120211212 is an apocalyptic number.

It is an amenable number.

21120211212 is an abundant number, since it is smaller than the sum of its proper divisors (29654345460).

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

21120211212 is a wasteful number, since it uses less digits than its factorization.

21120211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331558 (or 331556 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120211212 its reverse (21211202112), we get a palindrome (42331413324).

The spelling of 21120211212 in words is "twenty-one billion, one hundred twenty million, two hundred eleven thousand, two hundred twelve".