42120140421 has 4 divisors (see below), whose sum is σ = 56160187232. Its totient is φ = 28080093612.

The previous prime is 42120140371. The next prime is 42120140453. The reversal of 42120140421 is 12404102124.

42120140421 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 not a de Polignac number, because 42120140421 - 2²⁶ = 42053031557 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 (42120140521) 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, 7020023401 + ... + 7020023406.

It is an arithmetic number, because the mean of its divisors is an integer number (14040046808).

Almost surely, 2^42120140421 is an apocalyptic number.

It is an amenable number.

42120140421 is a deficient number, since it is larger than the sum of its proper divisors (14040046811).

42120140421 is a wasteful number, since it uses less digits than its factorization.

42120140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14040046810.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 42120140421 its reverse (12404102124), we get a palindrome (54524242545).

The spelling of 42120140421 in words is "forty-two billion, one hundred twenty million, one hundred forty thousand, four hundred twenty-one".