1211164321 has 4 divisors (see below), whose sum is σ = 1234016532. Its totient is φ = 1188312112.

The previous prime is 1211164319. The next prime is 1211164369. The reversal of 1211164321 is 1234611121.

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 412536721 + 798627600 = 20311^2 + 28260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211164321 - 2¹ = 1211164319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211164292 and 1211164301.

It is not an unprimeable number, because it can be changed into a prime (1211164121) 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, 11426026 + ... + 11426131.

It is an arithmetic number, because the mean of its divisors is an integer number (308504133).

Almost surely, 2^1211164321 is an apocalyptic number.

It is an amenable number.

1211164321 is a deficient number, since it is larger than the sum of its proper divisors (22852211).

1211164321 is an equidigital number, since it uses as much as digits as its factorization.

1211164321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22852210.

The product of its digits is 288, while the sum is 22.

The square root of 1211164321 is about 34801.7861754250. The cubic root of 1211164321 is about 1065.9439186728.

Adding to 1211164321 its reverse (1234611121), we get a palindrome (2445775442).

The spelling of 1211164321 in words is "one billion, two hundred eleven million, one hundred sixty-four thousand, three hundred twenty-one".