20121211210112 has 32 divisors (see below), whose sum is σ = 40087433671200. Its totient is φ = 10060051386880.

The previous prime is 20121211210109. The next prime is 20121211210127. The reversal of 20121211210112 is 21101211212102.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-4 number, since 4×20121211210112⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1992287 + ... + 6649182.

It is an arithmetic number, because the mean of its divisors is an integer number (1252732302225).

Almost surely, 2^{20121211210112} is an apocalyptic number.

It is an amenable number.

20121211210112 is a deficient number, since it is larger than the sum of its proper divisors (19966222461088).

20121211210112 is an equidigital number, since it uses as much as digits as its factorization.

20121211210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8659674 (or 8659662 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20121211210112 its reverse (21101211212102), we get a palindrome (41222422422214).

The spelling of 20121211210112 in words is "twenty trillion, one hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, one hundred twelve".