342402115721 has 4 divisors (see below), whose sum is σ = 342502442052. Its totient is φ = 342301789392.

The previous prime is 342402115697. The next prime is 342402115723. The reversal of 342402115721 is 127511204243.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 201672846400 + 140729269321 = 449080^2 + 375139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-342402115721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (342402115723) 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, 50158046 + ... + 50164871.

It is an arithmetic number, because the mean of its divisors is an integer number (85625610513).

Almost surely, 2^342402115721 is an apocalyptic number.

It is an amenable number.

342402115721 is a deficient number, since it is larger than the sum of its proper divisors (100326331).

342402115721 is a wasteful number, since it uses less digits than its factorization.

342402115721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100326330.

The product of its (nonzero) digits is 13440, while the sum is 32.

Adding to 342402115721 its reverse (127511204243), we get a palindrome (469913319964).

The spelling of 342402115721 in words is "three hundred forty-two billion, four hundred two million, one hundred fifteen thousand, seven hundred twenty-one".