21102201200 has 30 divisors (see below), whose sum is σ = 50698039344. Its totient is φ = 8440880320.

The previous prime is 21102201187. The next prime is 21102201217. The reversal of 21102201200 is 210220112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26377352 + ... + 26378151.

Almost surely, 2^21102201200 is an apocalyptic number.

21102201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102201200 is an abundant number, since it is smaller than the sum of its proper divisors (29595838144).

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

21102201200 is a wasteful number, since it uses less digits than its factorization.

21102201200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52755521 (or 52755510 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21102201200 its reverse (210220112), we get a palindrome (21312421312).

The spelling of 21102201200 in words is "twenty-one billion, one hundred two million, two hundred one thousand, two hundred".