21435146236 has 36 divisors (see below), whose sum is σ = 43831599168. Its totient is φ = 9145277568.

The previous prime is 21435146209. The next prime is 21435146237. The reversal of 21435146236 is 63264153412.

It is a junction number, because it is equal to n+sod(n) for n = 21435146195 and 21435146204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21435146237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201501 + ... + 288916.

Almost surely, 2^21435146236 is an apocalyptic number.

It is an amenable number.

21435146236 is an abundant number, since it is smaller than the sum of its proper divisors (22396452932).

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

21435146236 is a wasteful number, since it uses less digits than its factorization.

21435146236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490658 (or 490649 counting only the distinct ones).

The product of its digits is 103680, while the sum is 37.

Adding to 21435146236 its reverse (63264153412), we get a palindrome (84699299648).

The spelling of 21435146236 in words is "twenty-one billion, four hundred thirty-five million, one hundred forty-six thousand, two hundred thirty-six".