20011221012112 has 40 divisors (see below), whose sum is σ = 42297882396192. Its totient is φ = 9095700307200.

The previous prime is 20011221012071. The next prime is 20011221012169. The reversal of 20011221012112 is 21121012211002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3298863 + ... + 7134769.

Almost surely, 2^{20011221012112} is an apocalyptic number.

20011221012112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20011221012112 is an abundant number, since it is smaller than the sum of its proper divisors (22286661384080).

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

20011221012112 is a wasteful number, since it uses less digits than its factorization.

20011221012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865567 (or 3865561 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20011221012112 its reverse (21121012211002), we get a palindrome (41132233223114).

The spelling of 20011221012112 in words is "twenty trillion, eleven billion, two hundred twenty-one million, twelve thousand, one hundred twelve".