1345402121 has 4 divisors (see below), whose sum is σ = 1537602432. Its totient is φ = 1153201812.

The previous prime is 1345402109. The next prime is 1345402159. The reversal of 1345402121 is 1212045431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1212045431 = 83 ⋅14602957.

It is not a de Polignac number, because 1345402121 - 2¹⁴ = 1345385737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1345422121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96100145 + ... + 96100158.

It is an arithmetic number, because the mean of its divisors is an integer number (384400608).

Almost surely, 2^1345402121 is an apocalyptic number.

It is an amenable number.

1345402121 is a deficient number, since it is larger than the sum of its proper divisors (192200311).

1345402121 is an equidigital number, since it uses as much as digits as its factorization.

1345402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192200310.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1345402121 is about 36679.7235676606. The cubic root of 1345402121 is about 1103.9533016133.

Adding to 1345402121 its reverse (1212045431), we get a palindrome (2557447552).

The spelling of 1345402121 in words is "one billion, three hundred forty-five million, four hundred two thousand, one hundred twenty-one".