21335313104 has 80 divisors (see below), whose sum is σ = 50787225600. Its totient is φ = 8478110592.

The previous prime is 21335313067. The next prime is 21335313113. The reversal of 21335313104 is 40131353312.

It is a super-2 number, since 2×21335313104² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6644 + ... + 206675.

It is an arithmetic number, because the mean of its divisors is an integer number (634840320).

Almost surely, 2^21335313104 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 21335313104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25393612800).

21335313104 is an abundant number, since it is smaller than the sum of its proper divisors (29451912496).

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

21335313104 is a wasteful number, since it uses less digits than its factorization.

21335313104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213400 (or 213394 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21335313104 its reverse (40131353312), we get a palindrome (61466666416).

The spelling of 21335313104 in words is "twenty-one billion, three hundred thirty-five million, three hundred thirteen thousand, one hundred four".