21335435218 has 16 divisors (see below), whose sum is σ = 32059662336. Its totient is φ = 10648899360.

The previous prime is 21335435207. The next prime is 21335435243. The reversal of 21335435218 is 81253453312.

It is a happy 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, 3292830 + ... + 3299302.

It is an arithmetic number, because the mean of its divisors is an integer number (2003728896).

Almost surely, 2^21335435218 is an apocalyptic number.

21335435218 is a deficient number, since it is larger than the sum of its proper divisors (10724227118).

21335435218 is a wasteful number, since it uses less digits than its factorization.

21335435218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9129.

The product of its digits is 86400, while the sum is 37.

The spelling of 21335435218 in words is "twenty-one billion, three hundred thirty-five million, four hundred thirty-five thousand, two hundred eighteen".