1321212321 has 24 divisors (see below), whose sum is σ = 2242059456. Its totient is φ = 739139040.

The previous prime is 1321212293. The next prime is 1321212349. The reversal of 1321212321 is 1232121231.

1321212321 is a `hidden beast` number, since 1 + 321 + 21 + 2 + 321 = 666.

It is an interprime number because it is at equal distance from previous prime (1321212293) and next prime (1321212349).

It is not a de Polignac number, because 1321212321 - 2¹⁴ = 1321195937 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1321212294 and 1321212303.

It is not an unprimeable number, because it can be changed into a prime (1321212371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 512005 + ... + 514578.

It is an arithmetic number, because the mean of its divisors is an integer number (93419144).

Almost surely, 2^1321212321 is an apocalyptic number.

1321212321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321212321 is a deficient number, since it is larger than the sum of its proper divisors (920847135).

1321212321 is a wasteful number, since it uses less digits than its factorization.

1321212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026613 (or 1026610 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1321212321 is about 36348.4844388318. The cubic root of 1321212321 is about 1097.2970332926.

Adding to 1321212321 its reverse (1232121231), we get a palindrome (2553333552).

The spelling of 1321212321 in words is "one billion, three hundred twenty-one million, two hundred twelve thousand, three hundred twenty-one".