1321144215 has 16 divisors (see below), whose sum is σ = 2143604736. Its totient is φ = 694685600.

The previous prime is 1321144211. The next prime is 1321144243. The reversal of 1321144215 is 5124411231.

It is not a de Polignac number, because 1321144215 - 2² = 1321144211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321144211) 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, 619191 + ... + 621320.

It is an arithmetic number, because the mean of its divisors is an integer number (133975296).

Almost surely, 2^1321144215 is an apocalyptic number.

1321144215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1321144215 is a deficient number, since it is larger than the sum of its proper divisors (822460521).

1321144215 is a wasteful number, since it uses less digits than its factorization.

1321144215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240590.

The product of its digits is 960, while the sum is 24.

The square root of 1321144215 is about 36347.5475788945. The cubic root of 1321144215 is about 1097.2781784387.

Adding to 1321144215 its reverse (5124411231), we get a palindrome (6445555446).

The spelling of 1321144215 in words is "one billion, three hundred twenty-one million, one hundred forty-four thousand, two hundred fifteen".