1351343221 has 4 divisors (see below), whose sum is σ = 1352909952. Its totient is φ = 1349776492.

The previous prime is 1351343183. The next prime is 1351343237. The reversal of 1351343221 is 1223431531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1351343221 - 2⁷ = 1351343093 is a prime.

It is a super-2 number, since 2×1351343221² = 3652257001885309682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1351343291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782071 + ... + 783796.

It is an arithmetic number, because the mean of its divisors is an integer number (338227488).

Almost surely, 2^1351343221 is an apocalyptic number.

It is an amenable number.

1351343221 is a deficient number, since it is larger than the sum of its proper divisors (1566731).

1351343221 is an equidigital number, since it uses as much as digits as its factorization.

1351343221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566730.

The product of its digits is 2160, while the sum is 25.

The square root of 1351343221 is about 36760.6205197899. The cubic root of 1351343221 is about 1105.5758813087.

Adding to 1351343221 its reverse (1223431531), we get a palindrome (2574774752).

The spelling of 1351343221 in words is "one billion, three hundred fifty-one million, three hundred forty-three thousand, two hundred twenty-one".