1342745021 has 4 divisors (see below), whose sum is σ = 1371314112. Its totient is φ = 1314175932.

The previous prime is 1342745011. The next prime is 1342745071. The reversal of 1342745021 is 1205472431.

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 a de Polignac number, because none of the positive numbers 2^k-1342745021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1342745011) 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 3 ways as a sum of consecutive naturals, for example, 14284475 + ... + 14284568.

It is an arithmetic number, because the mean of its divisors is an integer number (342828528).

Almost surely, 2^1342745021 is an apocalyptic number.

It is an amenable number.

1342745021 is a deficient number, since it is larger than the sum of its proper divisors (28569091).

1342745021 is an equidigital number, since it uses as much as digits as its factorization.

1342745021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28569090.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 1342745021 is about 36643.4853828071. The cubic root of 1342745021 is about 1103.2260723234.

The spelling of 1342745021 in words is "one billion, three hundred forty-two million, seven hundred forty-five thousand, twenty-one".