21045104315 has 8 divisors (see below), whose sum is σ = 25334811168. Its totient is φ = 16782292800.

The previous prime is 21045104309. The next prime is 21045104347. The reversal of 21045104315 is 51340154012.

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

It is not a de Polignac number, because 21045104315 - 2³⁴ = 3865235131 is a prime.

It is a Duffinian number.

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, 6722111 + ... + 6725240.

It is an arithmetic number, because the mean of its divisors is an integer number (3166851396).

Almost surely, 2^21045104315 is an apocalyptic number.

21045104315 is a deficient number, since it is larger than the sum of its proper divisors (4289706853).

21045104315 is a wasteful number, since it uses less digits than its factorization.

21045104315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13447669.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21045104315 its reverse (51340154012), we get a palindrome (72385258327).

The spelling of 21045104315 in words is "twenty-one billion, forty-five million, one hundred four thousand, three hundred fifteen".