20021211212012 has 12 divisors (see below), whose sum is σ = 35037679017096. Its totient is φ = 10010445778560.

The previous prime is 20021211212011. The next prime is 20021211212021. The reversal of 20021211212012 is 21021211212002.

It is not an unprimeable number, because it can be changed into a prime (20021211212011) 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, 39674789 + ... + 40176252.

It is an arithmetic number, because the mean of its divisors is an integer number (2919806584758).

Almost surely, 2^{20021211212012} is an apocalyptic number.

It is an amenable number.

20021211212012 is a deficient number, since it is larger than the sum of its proper divisors (15016467805084).

20021211212012 is a wasteful number, since it uses less digits than its factorization.

20021211212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79913728 (or 79913726 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20021211212012 its reverse (21021211212002), we get a palindrome (41042422424014).

The spelling of 20021211212012 in words is "twenty trillion, twenty-one billion, two hundred eleven million, two hundred twelve thousand, twelve".