21045475353 has 16 divisors (see below), whose sum is σ = 32723772800. Its totient is φ = 12025985328.

The previous prime is 21045475333. The next prime is 21045475403. The reversal of 21045475353 is 35357454012.

It is not a de Polignac number, because 21045475353 - 2¹⁶ = 21045409817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21045475303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10225150 + ... + 10227207.

It is an arithmetic number, because the mean of its divisors is an integer number (2045235800).

Almost surely, 2^21045475353 is an apocalyptic number.

It is an amenable number.

21045475353 is a deficient number, since it is larger than the sum of its proper divisors (11678297447).

21045475353 is an equidigital number, since it uses as much as digits as its factorization.

21045475353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20452381 (or 20452367 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 39.

The spelling of 21045475353 in words is "twenty-one billion, forty-five million, four hundred seventy-five thousand, three hundred fifty-three".