1345142021 has 8 divisors (see below), whose sum is σ = 1379933184. Its totient is φ = 1310608080.

The previous prime is 1345142011. The next prime is 1345142023. The reversal of 1345142021 is 1202415431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1345142021 - 2⁶ = 1345141957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1345142023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53690 + ... + 74651.

It is an arithmetic number, because the mean of its divisors is an integer number (172491648).

Almost surely, 2^1345142021 is an apocalyptic number.

It is an amenable number.

1345142021 is a deficient number, since it is larger than the sum of its proper divisors (34791163).

1345142021 is a wasteful number, since it uses less digits than its factorization.

1345142021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128611.

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

The square root of 1345142021 is about 36676.1778406638. The cubic root of 1345142021 is about 1103.8821564008.

Adding to 1345142021 its reverse (1202415431), we get a palindrome (2547557452).

The spelling of 1345142021 in words is "one billion, three hundred forty-five million, one hundred forty-two thousand, twenty-one".