42131121140421 has 6 divisors (see below), whose sum is σ = 60856063869510. Its totient is φ = 28087414093608.

The previous prime is 42131121140413. The next prime is 42131121140447. The reversal of 42131121140421 is 12404112113124.

42131121140421 is a `hidden beast` number, since 4 + 2 + 13 + 11 + 211 + 4 + 0 + 421 = 666.

It can be written as a sum of positive squares in only one way, i.e., 33715093860900 + 8416027279521 = 5806470^2 + 2901039^2 .

It is not a de Polignac number, because 42131121140421 - 2³ = 42131121140413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131121140411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2340617841126 + ... + 2340617841143.

It is an arithmetic number, because the mean of its divisors is an integer number (10142677311585).

Almost surely, 2^{42131121140421} is an apocalyptic number.

It is an amenable number.

42131121140421 is a deficient number, since it is larger than the sum of its proper divisors (18724942729089).

42131121140421 is a wasteful number, since it uses less digits than its factorization.

42131121140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681235682275 (or 4681235682272 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

Adding to 42131121140421 its reverse (12404112113124), we get a palindrome (54535233253545).

The spelling of 42131121140421 in words is "forty-two trillion, one hundred thirty-one billion, one hundred twenty-one million, one hundred forty thousand, four hundred twenty-one".