21225545143441 has 4 divisors (see below), whose sum is σ = 21225633919972. Its totient is φ = 21225456366912.

The previous prime is 21225545143393. The next prime is 21225545143447. The reversal of 21225545143441 is 14434154552212.

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 7501595121216 + 13723950022225 = 2738904^2 + 3704585^2 .

It is a cyclic number.

It is not a de Polignac number, because 21225545143441 - 2¹¹ = 21225545141393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21225545143447) 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, 44028660 + ... + 44508133.

It is an arithmetic number, because the mean of its divisors is an integer number (5306408479993).

Almost surely, 2^{21225545143441} is an apocalyptic number.

It is an amenable number.

21225545143441 is a deficient number, since it is larger than the sum of its proper divisors (88776531).

21225545143441 is an equidigital number, since it uses as much as digits as its factorization.

21225545143441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88776530.

The product of its digits is 768000, while the sum is 43.

Adding to 21225545143441 its reverse (14434154552212), we get a palindrome (35659699695653).

The spelling of 21225545143441 in words is "twenty-one trillion, two hundred twenty-five billion, five hundred forty-five million, one hundred forty-three thousand, four hundred forty-one".