1121312421 has 6 divisors (see below), whose sum is σ = 1619673510. Its totient is φ = 747541608.

The previous prime is 1121312411. The next prime is 1121312429. The reversal of 1121312421 is 1242131211.

1121312421 is a `hidden beast` number, since 112 + 131 + 2 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1121312196 + 225 = 33486^2 + 15^2 .

It is not a de Polignac number, because 1121312421 - 2⁵ = 1121312389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121312394 and 1121312403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121312429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62295126 + ... + 62295143.

It is an arithmetic number, because the mean of its divisors is an integer number (269945585).

Almost surely, 2^1121312421 is an apocalyptic number.

It is an amenable number.

1121312421 is a deficient number, since it is larger than the sum of its proper divisors (498361089).

1121312421 is a wasteful number, since it uses less digits than its factorization.

1121312421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124590275 (or 124590272 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1121312421 is about 33486.0033596128. The cubic root of 1121312421 is about 1038.9043012146.

Adding to 1121312421 its reverse (1242131211), we get a palindrome (2363443632).

The spelling of 1121312421 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, four hundred twenty-one".