21445310041 has 4 divisors (see below), whose sum is σ = 21445614900. Its totient is φ = 21445005184.

The previous prime is 21445310011. The next prime is 21445310057. The reversal of 21445310041 is 14001354412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4897060441 + 16548249600 = 69979^2 + 128640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21445310041 - 2⁷ = 21445309913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21445309988 and 21445310015.

It is not an unprimeable number, because it can be changed into a prime (21445310011) 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, 12765 + ... + 207493.

It is an arithmetic number, because the mean of its divisors is an integer number (5361403725).

Almost surely, 2^21445310041 is an apocalyptic number.

It is an amenable number.

21445310041 is a deficient number, since it is larger than the sum of its proper divisors (304859).

21445310041 is a wasteful number, since it uses less digits than its factorization.

21445310041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304858.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21445310041 its reverse (14001354412), we get a palindrome (35446664453).

The spelling of 21445310041 in words is "twenty-one billion, four hundred forty-five million, three hundred ten thousand, forty-one".