21144400444210 has 32 divisors (see below), whose sum is σ = 38084915761200. Its totient is φ = 8452207472640.

The previous prime is 21144400444199. The next prime is 21144400444283. The reversal of 21144400444210 is 1244400444112.

It can be written as a sum of positive squares in 8 ways, for example, as 12731958466969 + 8412441977241 = 3568187^2 + 2900421^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100683996 + ... + 100893784.

Almost surely, 2^{21144400444210} is an apocalyptic number.

21144400444210 is a deficient number, since it is larger than the sum of its proper divisors (16940515316990).

21144400444210 is a wasteful number, since it uses less digits than its factorization.

21144400444210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216366.

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 21144400444210 its reverse (1244400444112), we get a palindrome (22388800888322).

The spelling of 21144400444210 in words is "twenty-one trillion, one hundred forty-four billion, four hundred million, four hundred forty-four thousand, two hundred ten".