21403402041041 has 4 divisors (see below), whose sum is σ = 22662425690532. Its totient is φ = 20144378391552.

The previous prime is 21403402041037. The next prime is 21403402041053. The reversal of 21403402041041 is 14014020430412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6406487458816 + 14996914582225 = 2531104^2 + 3872585^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403402041041 - 2² = 21403402041037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21403402041041.

It is not an unprimeable number, because it can be changed into a prime (21403402041061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629511824720 + ... + 629511824753.

It is an arithmetic number, because the mean of its divisors is an integer number (5665606422633).

Almost surely, 2^{21403402041041} is an apocalyptic number.

It is an amenable number.

21403402041041 is a deficient number, since it is larger than the sum of its proper divisors (1259023649491).

21403402041041 is a wasteful number, since it uses less digits than its factorization.

21403402041041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259023649490.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21403402041041 its reverse (14014020430412), we get a palindrome (35417422471453).

The spelling of 21403402041041 in words is "twenty-one trillion, four hundred three billion, four hundred two million, forty-one thousand, forty-one".