1211142321 has 16 divisors (see below), whose sum is σ = 1802797120. Its totient is φ = 803597760.

The previous prime is 1211142313. The next prime is 1211142397. The reversal of 1211142321 is 1232411121.

It is not a de Polignac number, because 1211142321 - 2³ = 1211142313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211142294 and 1211142303.

It is not an unprimeable number, because it can be changed into a prime (1211142301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100600 + ... + 111993.

It is an arithmetic number, because the mean of its divisors is an integer number (112674820).

Almost surely, 2^1211142321 is an apocalyptic number.

It is an amenable number.

1211142321 is a deficient number, since it is larger than the sum of its proper divisors (591654799).

1211142321 is a wasteful number, since it uses less digits than its factorization.

1211142321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212813 (or 212807 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1211142321 is about 34801.4700982588. The cubic root of 1211142321 is about 1065.9374645780.

Adding to 1211142321 its reverse (1232411121), we get a palindrome (2443553442).

The spelling of 1211142321 in words is "one billion, two hundred eleven million, one hundred forty-two thousand, three hundred twenty-one".