42129250838 has 4 divisors (see below), whose sum is σ = 63193876260. Its totient is φ = 21064625418.

The previous prime is 42129250831. The next prime is 42129250843. The reversal of 42129250838 is 83805292124.

42129250838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×42129250838² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42129250831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532312708 + ... + 10532312711.

It is an arithmetic number, because the mean of its divisors is an integer number (15798469065).

Almost surely, 2^42129250838 is an apocalyptic number.

42129250838 is a deficient number, since it is larger than the sum of its proper divisors (21064625422).

42129250838 is a wasteful number, since it uses less digits than its factorization.

42129250838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21064625421.

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 42129250838 in words is "forty-two billion, one hundred twenty-nine million, two hundred fifty thousand, eight hundred thirty-eight".