1321121151 has 16 divisors (see below), whose sum is σ = 2236819200. Its totient is φ = 754926264.

The previous prime is 1321121111. The next prime is 1321121161. The reversal of 1321121151 is 1511211231.

It is not a de Polignac number, because 1321121151 - 2⁷ = 1321121023 is a prime.

It is a super-2 number, since 2×1321121151² = 3490722191239129602, which contains 22 as substring.

It is a congruent number.

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, 3494841 + ... + 3495218.

It is an arithmetic number, because the mean of its divisors is an integer number (139801200).

Almost surely, 2^1321121151 is an apocalyptic number.

1321121151 is a deficient number, since it is larger than the sum of its proper divisors (915698049).

1321121151 is an equidigital number, since it uses as much as digits as its factorization.

1321121151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990075 (or 6990069 counting only the distinct ones).

The product of its digits is 60, while the sum is 18.

The square root of 1321121151 is about 36347.2303071362. The cubic root of 1321121151 is about 1097.2717931224.

Adding to 1321121151 its reverse (1511211231), we get a palindrome (2832332382).

The spelling of 1321121151 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred fifty-one".