1321221121 has 8 divisors (see below), whose sum is σ = 1491033600. Its totient is φ = 1159692240.

The previous prime is 1321221119. The next prime is 1321221137. The reversal of 1321221121 is 1211221231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321221121 - 2¹ = 1321221119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321221095 and 1321221104.

It is not an unprimeable number, because it can be changed into a prime (1321221151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2070561 + ... + 2071198.

It is an arithmetic number, because the mean of its divisors is an integer number (186379200).

Almost surely, 2^1321221121 is an apocalyptic number.

1321221121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321221121 is a deficient number, since it is larger than the sum of its proper divisors (169812479).

1321221121 is a wasteful number, since it uses less digits than its factorization.

1321221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141799.

The product of its digits is 48, while the sum is 16.

The square root of 1321221121 is about 36348.6054890693. The cubic root of 1321221121 is about 1097.2994694876.

Adding to 1321221121 its reverse (1211221231), we get a palindrome (2532442352).

The spelling of 1321221121 in words is "one billion, three hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".