21500310404330 has 16 divisors (see below), whose sum is σ = 38755143449640. Its totient is φ = 8587994223552.

The previous prime is 21500310404317. The next prime is 21500310404369. The reversal of 21500310404330 is 3340401300512.

It can be written as a sum of positive squares in 4 ways, for example, as 16102266894169 + 5398043510161 = 4012763^2 + 2323369^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21500310404330.

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, 1516234829 + ... + 1516249008.

Almost surely, 2^{21500310404330} is an apocalyptic number.

21500310404330 is a deficient number, since it is larger than the sum of its proper divisors (17254833045310).

21500310404330 is a wasteful number, since it uses less digits than its factorization.

21500310404330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032484553.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21500310404330 its reverse (3340401300512), we get a palindrome (24840711704842).

The spelling of 21500310404330 in words is "twenty-one trillion, five hundred billion, three hundred ten million, four hundred four thousand, three hundred thirty".