1351324021 has 2 divisors, whose sum is σ = 1351324022. Its totient is φ = 1351324020.

The previous prime is 1351324019. The next prime is 1351324031. The reversal of 1351324021 is 1204231531.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1223950225 + 127373796 = 34985^2 + 11286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351324021 - 2¹ = 1351324019 is a prime.

Together with 1351324019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1351323983 and 1351324001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351324001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675662010 + 675662011.

It is an arithmetic number, because the mean of its divisors is an integer number (675662011).

Almost surely, 2^1351324021 is an apocalyptic number.

It is an amenable number.

1351324021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351324021 is an equidigital number, since it uses as much as digits as its factorization.

1351324021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1351324021 is about 36760.3593698429. The cubic root of 1351324021 is about 1105.5706452450.

Adding to 1351324021 its reverse (1204231531), we get a palindrome (2555555552).

The spelling of 1351324021 in words is "one billion, three hundred fifty-one million, three hundred twenty-four thousand, twenty-one".