21204132124484 has 24 divisors (see below), whose sum is σ = 37679868487800. Its totient is φ = 10439443998720.

The previous prime is 21204132124429. The next prime is 21204132124517. The reversal of 21204132124484 is 48442123140212.

It can be written as a sum of positive squares in 4 ways, for example, as 6822805202500 + 14381326921984 = 2612050^2 + 3792272^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123487169 + ... + 123658760.

It is an arithmetic number, because the mean of its divisors is an integer number (1569994520325).

Almost surely, 2^{21204132124484} is an apocalyptic number.

It is an amenable number.

21204132124484 is a deficient number, since it is larger than the sum of its proper divisors (16475736363316).

21204132124484 is a wasteful number, since it uses less digits than its factorization.

21204132124484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247146263 (or 247146261 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 38.

Adding to 21204132124484 its reverse (48442123140212), we get a palindrome (69646255264696).

The spelling of 21204132124484 in words is "twenty-one trillion, two hundred four billion, one hundred thirty-two million, one hundred twenty-four thousand, four hundred eighty-four".