21200035552 has 24 divisors (see below), whose sum is σ = 41924748096. Its totient is φ = 10552480512.

The previous prime is 21200035513. The next prime is 21200035553. The reversal of 21200035552 is 25553000212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200035553) 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, 1478293 + ... + 1492564.

It is an arithmetic number, because the mean of its divisors is an integer number (1746864504).

Almost surely, 2^21200035552 is an apocalyptic number.

It is an amenable number.

21200035552 is a deficient number, since it is larger than the sum of its proper divisors (20724712544).

21200035552 is a wasteful number, since it uses less digits than its factorization.

21200035552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971090 (or 2971082 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 21200035552 its reverse (25553000212), we get a palindrome (46753035764).

The spelling of 21200035552 in words is "twenty-one billion, two hundred million, thirty-five thousand, five hundred fifty-two".