21049338936 has 128 divisors (see below), whose sum is σ = 58796236800. Its totient is φ = 6240706560.

The previous prime is 21049338929. The next prime is 21049338941. The reversal of 21049338936 is 63983394012.

It is a happy number.

It is a super-3 number, since 3×21049338936³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3353481 + ... + 3359751.

It is an arithmetic number, because the mean of its divisors is an integer number (459345600).

Almost surely, 2^21049338936 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 21049338936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29398118400).

21049338936 is an abundant number, since it is smaller than the sum of its proper divisors (37746897864).

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

21049338936 is a wasteful number, since it uses less digits than its factorization.

21049338936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6749 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 48.

The spelling of 21049338936 in words is "twenty-one billion, forty-nine million, three hundred thirty-eight thousand, nine hundred thirty-six".