20121211212 has 48 divisors (see below), whose sum is σ = 47487132000. Its totient is φ = 6630543360.

The previous prime is 20121211171. The next prime is 20121211267. The reversal of 20121211212 is 21211212102.

It is a junction number, because it is equal to n+sod(n) for n = 20121211191 and 20121211200.

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, 570162 + ... + 604422.

It is an arithmetic number, because the mean of its divisors is an integer number (989315250).

Almost surely, 2^20121211212 is an apocalyptic number.

It is an amenable number.

20121211212 is an abundant number, since it is smaller than the sum of its proper divisors (27365920788).

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

20121211212 is a wasteful number, since it uses less digits than its factorization.

20121211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34826 (or 34824 counting only the distinct ones).

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

Adding to 20121211212 its reverse (21211212102), we get a palindrome (41332423314).

The spelling of 20121211212 in words is "twenty billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twelve".