21411210244 has 12 divisors (see below), whose sum is σ = 37890625500. Its totient is φ = 10585317248.

The previous prime is 21411210241. The next prime is 21411210251. The reversal of 21411210244 is 44201211412.

It can be written as a sum of positive squares in 2 ways, for example, as 2491207744 + 18920002500 = 49912^2 + 137550^2 .

It is a super-2 number, since 2×21411210244² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21411210241) 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, 30071569 + ... + 30072280.

It is an arithmetic number, because the mean of its divisors is an integer number (3157552125).

Almost surely, 2^21411210244 is an apocalyptic number.

It is an amenable number.

21411210244 is a deficient number, since it is larger than the sum of its proper divisors (16479415256).

21411210244 is a wasteful number, since it uses less digits than its factorization.

21411210244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60143942 (or 60143940 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21411210244 its reverse (44201211412), we get a palindrome (65612421656).

The spelling of 21411210244 in words is "twenty-one billion, four hundred eleven million, two hundred ten thousand, two hundred forty-four".