21200355052 has 12 divisors (see below), whose sum is σ = 37125682776. Its totient is φ = 10593017120.

The previous prime is 21200355023. The next prime is 21200355073. The reversal of 21200355052 is 25055300212.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1783438 + ... + 1795285.

It is an arithmetic number, because the mean of its divisors is an integer number (3093806898).

Almost surely, 2^21200355052 is an apocalyptic number.

It is an amenable number.

21200355052 is a deficient number, since it is larger than the sum of its proper divisors (15925327724).

21200355052 is a wasteful number, since it uses less digits than its factorization.

21200355052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580208 (or 3580206 counting only the distinct ones).

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

Adding to 21200355052 its reverse (25055300212), we get a palindrome (46255655264).

The spelling of 21200355052 in words is "twenty-one billion, two hundred million, three hundred fifty-five thousand, fifty-two".