1013213231221 has 4 divisors (see below), whose sum is σ = 1013518511200. Its totient is φ = 1012907951244.

The previous prime is 1013213231189. The next prime is 1013213231279. The reversal of 1013213231221 is 1221323123101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1013213231221 - 2⁵ = 1013213231189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1013213231192 and 1013213231201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1013213231291) 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, 152635011 + ... + 152641648.

It is an arithmetic number, because the mean of its divisors is an integer number (253379627800).

Almost surely, 2^{1013213231221} is an apocalyptic number.

It is an amenable number.

1013213231221 is a deficient number, since it is larger than the sum of its proper divisors (305279979).

1013213231221 is an equidigital number, since it uses as much as digits as its factorization.

1013213231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305279978.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1013213231221 its reverse (1221323123101), we get a palindrome (2234536354322).

It can be divided in two parts, 10 and 13213231221, that added together give a palindrome (13213231231).

The spelling of 1013213231221 in words is "one trillion, thirteen billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-one".