21022201200 has 1440 divisors, whose sum is σ = 95739094528. Its totient is φ = 3832012800.

The previous prime is 21022201177. The next prime is 21022201253. The reversal of 21022201200 is 210222012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 488888379 + ... + 488888421.

Almost surely, 2^21022201200 is an apocalyptic number.

21022201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022201200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47869547264).

21022201200 is an abundant number, since it is smaller than the sum of its proper divisors (74716893328).

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

21022201200 is a wasteful number, since it uses less digits than its factorization.

21022201200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21022201200 its reverse (210222012), we get a palindrome (21232423212).

21022201200 divided by its reverse (210222012) gives a square (100 = 10²).

It can be divided in two parts, 21022 and 201200, that added together give a palindrome (222222).

The spelling of 21022201200 in words is "twenty-one billion, twenty-two million, two hundred one thousand, two hundred".