21435006336 has 32 divisors (see below), whose sum is σ = 56936736600. Its totient is φ = 7145001984.

The previous prime is 21435006319. The next prime is 21435006401. The reversal of 21435006336 is 63360053412.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 21435006297 and 21435006306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27909781 + ... + 27910548.

Almost surely, 2^21435006336 is an apocalyptic number.

It is an amenable number.

21435006336 is an abundant number, since it is smaller than the sum of its proper divisors (35501730264).

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

21435006336 is an equidigital number, since it uses as much as digits as its factorization.

21435006336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55820346 (or 55820334 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

Adding to 21435006336 its reverse (63360053412), we get a palindrome (84795059748).

The spelling of 21435006336 in words is "twenty-one billion, four hundred thirty-five million, six thousand, three hundred thirty-six".