21200050552 has 16 divisors (see below), whose sum is σ = 39758518800. Its totient is φ = 10597778880.

The previous prime is 21200050517. The next prime is 21200050559. The reversal of 21200050552 is 25505000212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200050559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240349 + ... + 316492.

It is an arithmetic number, because the mean of its divisors is an integer number (2484907425).

Almost surely, 2^21200050552 is an apocalyptic number.

It is an amenable number.

21200050552 is a deficient number, since it is larger than the sum of its proper divisors (18558468248).

21200050552 is a wasteful number, since it uses less digits than its factorization.

21200050552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561606 (or 561602 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

Adding to 21200050552 its reverse (25505000212), we get a palindrome (46705050764).

The spelling of 21200050552 in words is "twenty-one billion, two hundred million, fifty thousand, five hundred fifty-two".