1121312021 has 2 divisors, whose sum is σ = 1121312022. Its totient is φ = 1121312020.

The previous prime is 1121312009. The next prime is 1121312033. The reversal of 1121312021 is 1202131211.

It is a balanced prime because it is at equal distance from previous prime (1121312009) and next prime (1121312033).

It can be written as a sum of positive squares in only one way, i.e., 992943121 + 128368900 = 31511^2 + 11330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121312021 - 2¹⁰ = 1121310997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121311987 and 1121312005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121312081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560656010 + 560656011.

It is an arithmetic number, because the mean of its divisors is an integer number (560656011).

Almost surely, 2^1121312021 is an apocalyptic number.

It is an amenable number.

1121312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121312021 is an equidigital number, since it uses as much as digits as its factorization.

1121312021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1121312021 is about 33485.9973869676. The cubic root of 1121312021 is about 1038.9041776803.

Adding to 1121312021 its reverse (1202131211), we get a palindrome (2323443232).

The spelling of 1121312021 in words is "one billion, one hundred twenty-one million, three hundred twelve thousand, twenty-one".