21103231201020 has 72 divisors (see below), whose sum is σ = 64437062770080. Its totient is φ = 5590259913600.

The previous prime is 21103231201001. The next prime is 21103231201099. The reversal of 21103231201020 is 2010213230112.

21103231201020 is a `hidden beast` number, since 211 + 0 + 3 + 231 + 201 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21103231200984 and 21103231201002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 388185315 + ... + 388239674.

It is an arithmetic number, because the mean of its divisors is an integer number (894959205140).

Almost surely, 2^{21103231201020} is an apocalyptic number.

21103231201020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103231201020 is an abundant number, since it is smaller than the sum of its proper divisors (43333831569060).

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

21103231201020 is a wasteful number, since it uses less digits than its factorization.

21103231201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776425155 (or 776425150 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21103231201020 its reverse (2010213230112), we get a palindrome (23113444431132).

The spelling of 21103231201020 in words is "twenty-one trillion, one hundred three billion, two hundred thirty-one million, two hundred one thousand, twenty".