21051303336 has 96 divisors (see below), whose sum is σ = 65221752960. Its totient is φ = 6008846976.

The previous prime is 21051303323. The next prime is 21051303347. The reversal of 21051303336 is 63330315012.

It is a happy number.

21051303336 is a `hidden beast` number, since 21 + 0 + 5 + 1 + 303 + 336 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516106 + ... + 555398.

It is an arithmetic number, because the mean of its divisors is an integer number (679393260).

Almost surely, 2^21051303336 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21051303336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32610876480).

21051303336 is an abundant number, since it is smaller than the sum of its proper divisors (44170449624).

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

21051303336 is a wasteful number, since it uses less digits than its factorization.

21051303336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40375 (or 40368 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 27.

Adding to 21051303336 its reverse (63330315012), we get a palindrome (84381618348).

The spelling of 21051303336 in words is "twenty-one billion, fifty-one million, three hundred three thousand, three hundred thirty-six".