21120211212212 has 48 divisors (see below), whose sum is σ = 43334130688128. Its totient is φ = 8819926600320.

The previous prime is 21120211212131. The next prime is 21120211212241. The reversal of 21120211212212 is 21221211202112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57599783 + ... + 57965294.

It is an arithmetic number, because the mean of its divisors is an integer number (902794389336).

Almost surely, 2^{21120211212212} is an apocalyptic number.

It is an amenable number.

21120211212212 is an abundant number, since it is smaller than the sum of its proper divisors (22213919475916).

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

21120211212212 is a wasteful number, since it uses less digits than its factorization.

21120211212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115565256 (or 115565254 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21120211212212 its reverse (21221211202112), we get a palindrome (42341422414324).

It can be divided in two parts, 2112021 and 1212212, that added together give a palindrome (3324233).

The spelling of 21120211212212 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twelve thousand, two hundred twelve".