20021211212 has 12 divisors (see below), whose sum is σ = 36560472816. Its totient is φ = 9575361840.

The previous prime is 20021211211. The next prime is 20021211239. The reversal of 20021211212 is 21211212002.

It is not an unprimeable number, because it can be changed into a prime (20021211211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108810839 + ... + 108811022.

It is an arithmetic number, because the mean of its divisors is an integer number (3046706068).

Almost surely, 2^20021211212 is an apocalyptic number.

It is an amenable number.

20021211212 is a deficient number, since it is larger than the sum of its proper divisors (16539261604).

20021211212 is a wasteful number, since it uses less digits than its factorization.

20021211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217621888 (or 217621886 counting only the distinct ones).

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

Adding to 20021211212 its reverse (21211212002), we get a palindrome (41232423214).

The spelling of 20021211212 in words is "twenty billion, twenty-one million, two hundred eleven thousand, two hundred twelve".