21050233552 has 40 divisors (see below), whose sum is σ = 42237907712. Its totient is φ = 10152345600.

The previous prime is 21050233517. The next prime is 21050233619. The reversal of 21050233552 is 25533205012.

It is a super-2 number, since 2×21050233552² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21050233552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83152 + ... + 221392.

Almost surely, 2^21050233552 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 21050233552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21118953856).

21050233552 is an abundant number, since it is smaller than the sum of its proper divisors (21187674160).

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

21050233552 is a wasteful number, since it uses less digits than its factorization.

21050233552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138587 (or 138581 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

Adding to 21050233552 its reverse (25533205012), we get a palindrome (46583438564).

The spelling of 21050233552 in words is "twenty-one billion, fifty million, two hundred thirty-three thousand, five hundred fifty-two".