21041331403042 has 4 divisors (see below), whose sum is σ = 31561997104566. Its totient is φ = 10520665701520.

The previous prime is 21041331403007. The next prime is 21041331403097. The reversal of 21041331403042 is 24030413314012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20937680244441 + 103651158601 = 4575771^2 + 321949^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21041331403042.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260332850759 + ... + 5260332850762.

Almost surely, 2^{21041331403042} is an apocalyptic number.

21041331403042 is a deficient number, since it is larger than the sum of its proper divisors (10520665701524).

21041331403042 is a wasteful number, since it uses less digits than its factorization.

21041331403042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10520665701523.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21041331403042 its reverse (24030413314012), we get a palindrome (45071744717054).

The spelling of 21041331403042 in words is "twenty-one trillion, forty-one billion, three hundred thirty-one million, four hundred three thousand, forty-two".