21040403220042 has 16 divisors (see below), whose sum is σ = 42084423944640. Its totient is φ = 7012864822592.

The previous prime is 21040403220029. The next prime is 21040403220047. The reversal of 21040403220042 is 24002230404012.

It is a junction number, because it is equal to n+sod(n) for n = 21040403219994 and 21040403220021.

It is not an unprimeable number, because it can be changed into a prime (21040403220047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150653742 + ... + 150793337.

It is an arithmetic number, because the mean of its divisors is an integer number (2630276496540).

Almost surely, 2^{21040403220042} is an apocalyptic number.

21040403220042 is an abundant number, since it is smaller than the sum of its proper divisors (21044020724598).

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

21040403220042 is a wasteful number, since it uses less digits than its factorization.

21040403220042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301458717.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21040403220042 its reverse (24002230404012), we get a palindrome (45042633624054).

The spelling of 21040403220042 in words is "twenty-one trillion, forty billion, four hundred three million, two hundred twenty thousand, forty-two".