1213220321101 has 4 divisors (see below), whose sum is σ = 1213479949212. Its totient is φ = 1212960692992.

The previous prime is 1213220321077. The next prime is 1213220321179. The reversal of 1213220321101 is 1011230223121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 546549704100 + 666670617001 = 739290^2 + 816499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213220321101 - 2²⁵ = 1213186766669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213220321501) 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, 129807046 + ... + 129816391.

It is an arithmetic number, because the mean of its divisors is an integer number (303369987303).

Almost surely, 2^{1213220321101} is an apocalyptic number.

It is an amenable number.

1213220321101 is a deficient number, since it is larger than the sum of its proper divisors (259628111).

1213220321101 is an equidigital number, since it uses as much as digits as its factorization.

1213220321101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259628110.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1213220321101 its reverse (1011230223121), we get a palindrome (2224450544222).

The spelling of 1213220321101 in words is "one trillion, two hundred thirteen billion, two hundred twenty million, three hundred twenty-one thousand, one hundred one".