21204440244410 has 32 divisors (see below), whose sum is σ = 38696324380560. Its totient is φ = 8364401929728.

The previous prime is 21204440244401. The next prime is 21204440244419. The reversal of 21204440244410 is 1444204440212.

It is an interprime number because it is at equal distance from previous prime (21204440244401) and next prime (21204440244419).

It can be written as a sum of positive squares in 8 ways, for example, as 14329079032129 + 6875361212281 = 3785377^2 + 2622091^2 .

It is not an unprimeable number, because it can be changed into a prime (21204440244419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3105824 + ... + 7214916.

Almost surely, 2^{21204440244410} is an apocalyptic number.

21204440244410 is a deficient number, since it is larger than the sum of its proper divisors (17491884136150).

21204440244410 is a wasteful number, since it uses less digits than its factorization.

21204440244410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4116242.

The product of its (nonzero) digits is 32768, while the sum is 32.

Adding to 21204440244410 its reverse (1444204440212), we get a palindrome (22648644684622).

The spelling of 21204440244410 in words is "twenty-one trillion, two hundred four billion, four hundred forty million, two hundred forty-four thousand, four hundred ten".