21020020201120 has 24 divisors (see below), whose sum is σ = 49659797725524. Its totient is φ = 8408008080384.

The previous prime is 21020020201109. The next prime is 21020020201127. The reversal of 21020020201120 is 2110202002012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21017053438096 + 2966763024 = 4584436^2 + 54468^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21020020201120.

It is not an unprimeable number, because it can be changed into a prime (21020020201127) 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, 65687562969 + ... + 65687563288.

Almost surely, 2^{21020020201120} is an apocalyptic number.

21020020201120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020020201120 is an abundant number, since it is smaller than the sum of its proper divisors (28639777524404).

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

21020020201120 is a wasteful number, since it uses less digits than its factorization.

21020020201120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131375126272 (or 131375126264 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21020020201120 its reverse (2110202002012), we get a palindrome (23130222203132).

The spelling of 21020020201120 in words is "twenty-one trillion, twenty billion, twenty million, two hundred one thousand, one hundred twenty".