21255351403441 has 4 divisors (see below), whose sum is σ = 21255547795300. Its totient is φ = 21255155011584.

The previous prime is 21255351403337. The next prime is 21255351403471. The reversal of 21255351403441 is 14430415355212.

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 1874445762816 + 19380905640625 = 1369104^2 + 4402375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21255351403441 - 2²⁵ = 21255317849009 is a prime.

It is a super-2 number, since 2×21255351403441² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21255351403394 and 21255351403403.

It is not an unprimeable number, because it can be changed into a prime (21255351403471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98033496 + ... + 98250073.

It is an arithmetic number, because the mean of its divisors is an integer number (5313886948825).

Almost surely, 2^{21255351403441} is an apocalyptic number.

It is an amenable number.

21255351403441 is a deficient number, since it is larger than the sum of its proper divisors (196391859).

21255351403441 is a wasteful number, since it uses less digits than its factorization.

21255351403441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196391858.

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 21255351403441 its reverse (14430415355212), we get a palindrome (35685766758653).

The spelling of 21255351403441 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred fifty-one million, four hundred three thousand, four hundred forty-one".