42126778011 has 4 divisors (see below), whose sum is σ = 56169037352. Its totient is φ = 28084518672.

The previous prime is 42126778007. The next prime is 42126778021. The reversal of 42126778011 is 11087762124.

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

It is not a de Polignac number, because 42126778011 - 2² = 42126778007 is a prime.

It is a super-2 number, since 2×42126778011² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42126778021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7021129666 + ... + 7021129671.

It is an arithmetic number, because the mean of its divisors is an integer number (14042259338).

Almost surely, 2^42126778011 is an apocalyptic number.

42126778011 is a deficient number, since it is larger than the sum of its proper divisors (14042259341).

42126778011 is a wasteful number, since it uses less digits than its factorization.

42126778011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14042259340.

The product of its (nonzero) digits is 37632, while the sum is 39.

The spelling of 42126778011 in words is "forty-two billion, one hundred twenty-six million, seven hundred seventy-eight thousand, eleven".