1321211131 has 4 divisors (see below), whose sum is σ = 1343604600. Its totient is φ = 1298817664.

The previous prime is 1321211119. The next prime is 1321211137. The reversal of 1321211131 is 1311121231.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1321211131 - 2¹¹ = 1321209083 is a prime.

It is a super-2 number, since 2×1321211131² = 3491197705356598322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321211137) 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, 11196646 + ... + 11196763.

It is an arithmetic number, because the mean of its divisors is an integer number (335901150).

Almost surely, 2^1321211131 is an apocalyptic number.

1321211131 is a deficient number, since it is larger than the sum of its proper divisors (22393469).

1321211131 is an equidigital number, since it uses as much as digits as its factorization.

1321211131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22393468.

The product of its digits is 36, while the sum is 16.

The square root of 1321211131 is about 36348.4680695074. The cubic root of 1321211131 is about 1097.2967038518.

Adding to 1321211131 its reverse (1311121231), we get a palindrome (2632332362).

The spelling of 1321211131 in words is "one billion, three hundred twenty-one million, two hundred eleven thousand, one hundred thirty-one".