42129476421 has 4 divisors (see below), whose sum is σ = 56172635232. Its totient is φ = 28086317612.

The previous prime is 42129476407. The next prime is 42129476461. The reversal of 42129476421 is 12467492124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42129476421 - 2⁷ = 42129476293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42129476461) 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 in 3 ways as a sum of consecutive naturals, for example, 7021579401 + ... + 7021579406.

It is an arithmetic number, because the mean of its divisors is an integer number (14043158808).

Almost surely, 2^42129476421 is an apocalyptic number.

It is an amenable number.

42129476421 is a deficient number, since it is larger than the sum of its proper divisors (14043158811).

42129476421 is a wasteful number, since it uses less digits than its factorization.

42129476421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14043158810.

The product of its digits is 193536, while the sum is 42.

The spelling of 42129476421 in words is "forty-two billion, one hundred twenty-nine million, four hundred seventy-six thousand, four hundred twenty-one".