42154122421 has 4 divisors (see below), whose sum is σ = 42181025152. Its totient is φ = 42127219692.

The previous prime is 42154122371. The next prime is 42154122433. The reversal of 42154122421 is 12422145124.

42154122421 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, 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 42154122421 - 2¹¹ = 42154120373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42154122421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42154122721) 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, 13449015 + ... + 13452148.

It is an arithmetic number, because the mean of its divisors is an integer number (10545256288).

Almost surely, 2^42154122421 is an apocalyptic number.

It is an amenable number.

42154122421 is a deficient number, since it is larger than the sum of its proper divisors (26902731).

42154122421 is a wasteful number, since it uses less digits than its factorization.

42154122421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26902730.

The product of its digits is 5120, while the sum is 28.

Adding to 42154122421 its reverse (12422145124), we get a palindrome (54576267545).

The spelling of 42154122421 in words is "forty-two billion, one hundred fifty-four million, one hundred twenty-two thousand, four hundred twenty-one".