2111542042 has 4 divisors (see below), whose sum is σ = 3167313066. Its totient is φ = 1055771020.

The previous prime is 2111542039. The next prime is 2111542049. The reversal of 2111542042 is 2402451112.

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., 1661296081 + 450245961 = 40759^2 + 21219^2 .

It is not an unprimeable number, because it can be changed into a prime (2111542049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 527885509 + ... + 527885512.

Almost surely, 2^2111542042 is an apocalyptic number.

2111542042 is a deficient number, since it is larger than the sum of its proper divisors (1055771024).

2111542042 is a wasteful number, since it uses less digits than its factorization.

2111542042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055771023.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2111542042 is about 45951.5183862296. The cubic root of 2111542042 is about 1282.9209906984.

Adding to 2111542042 its reverse (2402451112), we get a palindrome (4513993154).

The spelling of 2111542042 in words is "two billion, one hundred eleven million, five hundred forty-two thousand, forty-two".