42878537132421 has 4 divisors (see below), whose sum is σ = 57171382843232. Its totient is φ = 28585691421612.

The previous prime is 42878537132393. The next prime is 42878537132423. The reversal of 42878537132421 is 12423173587824.

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 not a de Polignac number, because 42878537132421 - 2¹⁵ = 42878537099653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42878537132423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7146422855401 + ... + 7146422855406.

It is an arithmetic number, because the mean of its divisors is an integer number (14292845710808).

Almost surely, 2^{42878537132421} is an apocalyptic number.

It is an amenable number.

42878537132421 is a deficient number, since it is larger than the sum of its proper divisors (14292845710811).

42878537132421 is a wasteful number, since it uses less digits than its factorization.

42878537132421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14292845710810.

The product of its digits is 18063360, while the sum is 57.

The spelling of 42878537132421 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred thirty-seven million, one hundred thirty-two thousand, four hundred twenty-one".