202120342042 has 4 divisors (see below), whose sum is σ = 303180513066. Its totient is φ = 101060171020.

The previous prime is 202120342037. The next prime is 202120342063. The reversal of 202120342042 is 240243021202.

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

It can be written as a sum of positive squares in only one way, i.e., 162804987081 + 39315354961 = 403491^2 + 198281^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50530085509 + ... + 50530085512.

Almost surely, 2^202120342042 is an apocalyptic number.

202120342042 is a deficient number, since it is larger than the sum of its proper divisors (101060171024).

202120342042 is a wasteful number, since it uses less digits than its factorization.

202120342042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101060171023.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 202120342042 its reverse (240243021202), we get a palindrome (442363363244).

The spelling of 202120342042 in words is "two hundred two billion, one hundred twenty million, three hundred forty-two thousand, forty-two".