215126042 has 4 divisors (see below), whose sum is σ = 322689066. Its totient is φ = 107563020.

The previous prime is 215126039. The next prime is 215126047. The reversal of 215126042 is 240621512.

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 only one way, i.e., 205951201 + 9174841 = 14351^2 + 3029^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215125999 and 215126017.

It is not an unprimeable number, because it can be changed into a prime (215126047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53781509 + ... + 53781512.

Almost surely, 2^215126042 is an apocalyptic number.

215126042 is a deficient number, since it is larger than the sum of its proper divisors (107563024).

215126042 is a wasteful number, since it uses less digits than its factorization.

215126042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107563023.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 215126042 is about 14667.1756654102. The cubic root of 215126042 is about 599.1896857737.

Adding to 215126042 its reverse (240621512), we get a palindrome (455747554).

The spelling of 215126042 in words is "two hundred fifteen million, one hundred twenty-six thousand, forty-two".