20021100111212 has 12 divisors (see below), whose sum is σ = 35050627568880. Its totient is φ = 10006635091536.

The previous prime is 20021100111211. The next prime is 20021100111217. The reversal of 20021100111212 is 21211100112002.

It is not an unprimeable number, because it can be changed into a prime (20021100111211) 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, 978729512 + ... + 978749967.

It is an arithmetic number, because the mean of its divisors is an integer number (2920885630740).

Almost surely, 2^{20021100111212} is an apocalyptic number.

It is an amenable number.

20021100111212 is a deficient number, since it is larger than the sum of its proper divisors (15029527457668).

20021100111212 is a wasteful number, since it uses less digits than its factorization.

20021100111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957482040 (or 1957482038 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20021100111212 its reverse (21211100112002), we get a palindrome (41232200223214).

The spelling of 20021100111212 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred eleven thousand, two hundred twelve".