21635482218 has 32 divisors (see below), whose sum is σ = 49631086464. Its totient is φ = 6159246912.

The previous prime is 21635482213. The next prime is 21635482241. The reversal of 21635482218 is 81228453612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 21635482218.

It is not an unprimeable number, because it can be changed into a prime (21635482213) 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, 918205 + ... + 941472.

It is an arithmetic number, because the mean of its divisors is an integer number (1550971452).

Almost surely, 2^21635482218 is an apocalyptic number.

21635482218 is an abundant number, since it is smaller than the sum of its proper divisors (27995604246).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21635482218 is a wasteful number, since it uses less digits than its factorization.

21635482218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859966.

The product of its digits is 184320, while the sum is 42.

The spelling of 21635482218 in words is "twenty-one billion, six hundred thirty-five million, four hundred eighty-two thousand, two hundred eighteen".