1321121121 has 16 divisors (see below), whose sum is σ = 1805067264. Its totient is φ = 859020624.

The previous prime is 1321121111. The next prime is 1321121161. The reversal of 1321121121 is 1211211231.

It is not a de Polignac number, because 1321121121 - 2⁶ = 1321121057 is a prime.

It is a super-2 number, since 2×1321121121² = 3490722032704593282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321121121.

It is not an unprimeable number, because it can be changed into a prime (1321121101) 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, 86740 + ... + 100826.

It is an arithmetic number, because the mean of its divisors is an integer number (112816704).

Almost surely, 2^1321121121 is an apocalyptic number.

It is an amenable number.

1321121121 is a deficient number, since it is larger than the sum of its proper divisors (483946143).

1321121121 is a wasteful number, since it uses less digits than its factorization.

1321121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14860.

The product of its digits is 24, while the sum is 15.

The square root of 1321121121 is about 36347.2298944500. The cubic root of 1321121121 is about 1097.2717848168.

Adding to 1321121121 its reverse (1211211231), we get a palindrome (2532332352).

It can be divided in two parts, 132 and 1121121, that added together give a triangular number (1121253 = T₁₄₉₇).

The spelling of 1321121121 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".