21022001200 has 30 divisors (see below), whose sum is σ = 50505358844. Its totient is φ = 8408800320.

The previous prime is 21022001191. The next prime is 21022001227. The reversal of 21022001200 is 210022012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26277102 + ... + 26277901.

Almost surely, 2^21022001200 is an apocalyptic number.

21022001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022001200 is an abundant number, since it is smaller than the sum of its proper divisors (29483357644).

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

21022001200 is a wasteful number, since it uses less digits than its factorization.

21022001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52555021 (or 52555010 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21022001200 its reverse (210022012), we get a palindrome (21232023212).

The spelling of 21022001200 in words is "twenty-one billion, twenty-two million, one thousand, two hundred".