1201320231021 has 18 divisors (see below), whose sum is σ = 1745951638158. Its totient is φ = 795966620400.

The previous prime is 1201320231011. The next prime is 1201320231047.

1201320231021 is a `hidden beast` number, since 12 + 0 + 1 + 320 + 2 + 310 + 21 = 666.

1201320231021 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 766167596100 + 435152634921 = 875310^2 + 659661^2 .

It is not a de Polignac number, because 1201320231021 - 2¹⁰ = 1201320229997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201320230985 and 1201320231003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201320231011) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2272830 + ... + 2751071.

It is an arithmetic number, because the mean of its divisors is an integer number (96997313231).

Almost surely, 2^{1201320231021} is an apocalyptic number.

It is an amenable number.

1201320231021 is a deficient number, since it is larger than the sum of its proper divisors (544631407137).

1201320231021 is an equidigital number, since it uses as much as digits as its factorization.

1201320231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024233 (or 5024067 counting only the distinct ones).

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

It can be divided in two parts, 1201320 and 231021, that added together give a palindrome (1432341).

The spelling of 1201320231021 in words is "one trillion, two hundred one billion, three hundred twenty million, two hundred thirty-one thousand, twenty-one".