21002210441 has 8 divisors (see below), whose sum is σ = 21040914984. Its totient is φ = 20963543040.

The previous prime is 21002210393. The next prime is 21002210549. The reversal of 21002210441 is 14401220012.

It can be written as a sum of positive squares in 4 ways, for example, as 18388444816 + 2613765625 = 135604^2 + 51125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002210441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002210641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1282481 + ... + 1298753.

It is an arithmetic number, because the mean of its divisors is an integer number (2630114373).

Almost surely, 2^21002210441 is an apocalyptic number.

It is an amenable number.

21002210441 is a deficient number, since it is larger than the sum of its proper divisors (38704543).

21002210441 is a wasteful number, since it uses less digits than its factorization.

21002210441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18571.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002210441 its reverse (14401220012), we get a palindrome (35403430453).

The spelling of 21002210441 in words is "twenty-one billion, two million, two hundred ten thousand, four hundred forty-one".