21431025040242 has 16 divisors (see below), whose sum is σ = 43465740927552. Its totient is φ = 7043059872240.

The previous prime is 21431025040237. The next prime is 21431025040283. The reversal of 21431025040242 is 24204052013412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25153784833 + ... + 25153785684.

It is an arithmetic number, because the mean of its divisors is an integer number (2716608807972).

Almost surely, 2^{21431025040242} is an apocalyptic number.

21431025040242 is an abundant number, since it is smaller than the sum of its proper divisors (22034715887310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21431025040242 is a wasteful number, since it uses less digits than its factorization.

21431025040242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50307570593.

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21431025040242 its reverse (24204052013412), we get a palindrome (45635077053654).

The spelling of 21431025040242 in words is "twenty-one trillion, four hundred thirty-one billion, twenty-five million, forty thousand, two hundred forty-two".