342162721 has 4 divisors (see below), whose sum is σ = 342205744. Its totient is φ = 342119700.

The previous prime is 342162719. The next prime is 342162727. The reversal of 342162721 is 127261243.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127261243 = 1069 ⋅119047.

It is a cyclic number.

It is not a de Polignac number, because 342162721 - 2¹ = 342162719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 342162721.

It is not an unprimeable number, because it can be changed into a prime (342162727) 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, 5715 + ... + 26776.

It is an arithmetic number, because the mean of its divisors is an integer number (85551436).

Almost surely, 2^342162721 is an apocalyptic number.

It is an amenable number.

342162721 is a deficient number, since it is larger than the sum of its proper divisors (43023).

342162721 is a wasteful number, since it uses less digits than its factorization.

342162721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43022.

The product of its digits is 4032, while the sum is 28.

The square root of 342162721 is about 18497.6409577005. The cubic root of 342162721 is about 699.4299583643.

The spelling of 342162721 in words is "three hundred forty-two million, one hundred sixty-two thousand, seven hundred twenty-one".