21042140422 has 32 divisors (see below), whose sum is σ = 33612459840. Its totient is φ = 9845283840.

The previous prime is 21042140411. The next prime is 21042140423. The reversal of 21042140422 is 22404124012.

It is a junction number, because it is equal to n+sod(n) for n = 21042140393 and 21042140402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042140423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4860823 + ... + 4865149.

It is an arithmetic number, because the mean of its divisors is an integer number (1050389370).

Almost surely, 2^21042140422 is an apocalyptic number.

21042140422 is a deficient number, since it is larger than the sum of its proper divisors (12570319418).

21042140422 is a wasteful number, since it uses less digits than its factorization.

21042140422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21042140422 its reverse (22404124012), we get a palindrome (43446264434).

The spelling of 21042140422 in words is "twenty-one billion, forty-two million, one hundred forty thousand, four hundred twenty-two".