21045104313 has 4 divisors (see below), whose sum is σ = 28060139088. Its totient is φ = 14030069540.

The previous prime is 21045104309. The next prime is 21045104347. The reversal of 21045104313 is 31340154012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21045104313 - 2² = 21045104309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21045104513) 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 3 ways as a sum of consecutive naturals, for example, 3507517383 + ... + 3507517388.

It is an arithmetic number, because the mean of its divisors is an integer number (7015034772).

Almost surely, 2^21045104313 is an apocalyptic number.

It is an amenable number.

21045104313 is a deficient number, since it is larger than the sum of its proper divisors (7015034775).

21045104313 is an equidigital number, since it uses as much as digits as its factorization.

21045104313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7015034774.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21045104313 its reverse (31340154012), we get a palindrome (52385258325).

The spelling of 21045104313 in words is "twenty-one billion, forty-five million, one hundred four thousand, three hundred thirteen".