21000020201120 has 48 divisors (see below), whose sum is σ = 49721109271848. Its totient is φ = 8381627289600.

The previous prime is 21000020201093. The next prime is 21000020201207. The reversal of 21000020201120 is 2110202000012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20990655381136 + 9364819984 = 4581556^2 + 96772^2 .

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, 143526581 + ... + 143672820.

Almost surely, 2^{21000020201120} is an apocalyptic number.

21000020201120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000020201120 is an abundant number, since it is smaller than the sum of its proper divisors (28721089070728).

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

21000020201120 is a wasteful number, since it uses less digits than its factorization.

21000020201120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287199873 (or 287199865 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21000020201120 its reverse (2110202000012), we get a palindrome (23110222201132).

The spelling of 21000020201120 in words is "twenty-one trillion, twenty million, two hundred one thousand, one hundred twenty".