21010005235 has 8 divisors (see below), whose sum is σ = 25220690640. Its totient is φ = 16802214624.

The previous prime is 21010005227. The next prime is 21010005251. The reversal of 21010005235 is 53250001012.

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 21010005235 - 2³ = 21010005227 is a prime.

It is an unprimeable number.

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, 707697 + ... + 736786.

It is an arithmetic number, because the mean of its divisors is an integer number (3152586330).

Almost surely, 2^21010005235 is an apocalyptic number.

21010005235 is a deficient number, since it is larger than the sum of its proper divisors (4210685405).

21010005235 is a wasteful number, since it uses less digits than its factorization.

21010005235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447397.

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 21010005235 its reverse (53250001012), we get a palindrome (74260006247).

The spelling of 21010005235 in words is "twenty-one billion, ten million, five thousand, two hundred thirty-five".