20011221120 has 128 divisors (see below), whose sum is σ = 69584546880. Its totient is φ = 4851200000.

The previous prime is 20011221107. The next prime is 20011221127. The reversal of 20011221120 is 2112211002.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20011221096 and 20011221105.

It is not an unprimeable number, because it can be changed into a prime (20011221127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452631 + ... + 494870.

Almost surely, 2^20011221120 is an apocalyptic number.

20011221120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011221120 is an abundant number, since it is smaller than the sum of its proper divisors (49573325760).

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

20011221120 is a wasteful number, since it uses less digits than its factorization.

20011221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947534 (or 947522 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20011221120 its reverse (2112211002), we get a palindrome (22123432122).

The spelling of 20011221120 in words is "twenty billion, eleven million, two hundred twenty-one thousand, one hundred twenty".