21000004315 has 8 divisors (see below), whose sum is σ = 26526321360. Its totient is φ = 15915792672.

The previous prime is 21000004313. The next prime is 21000004321. The reversal of 21000004315 is 51340000012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000004315 - 2¹ = 21000004313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000004313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110526244 + ... + 110526433.

It is an arithmetic number, because the mean of its divisors is an integer number (3315790170).

Almost surely, 2^21000004315 is an apocalyptic number.

21000004315 is a deficient number, since it is larger than the sum of its proper divisors (5526317045).

21000004315 is a wasteful number, since it uses less digits than its factorization.

21000004315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221052701.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 21000004315 its reverse (51340000012), we get a palindrome (72340004327).

The spelling of 21000004315 in words is "twenty-one billion, four thousand, three hundred fifteen".