21002022011200 has 42 divisors (see below), whose sum is σ = 51678100415246. Its totient is φ = 8400808803840.

The previous prime is 21002022011171. The next prime is 21002022011207. The reversal of 21002022011200 is 211022020012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 955842539584 + 20046179471616 = 977672^2 + 4477296^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002022011207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6563130279 + ... + 6563133478.

Almost surely, 2^{21002022011200} is an apocalyptic number.

21002022011200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002022011200 is an abundant number, since it is smaller than the sum of its proper divisors (30676078404046).

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

21002022011200 is a wasteful number, since it uses less digits than its factorization.

21002022011200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13126263779 (or 13126263764 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002022011200 its reverse (211022020012), we get a palindrome (21213044031212).

The spelling of 21002022011200 in words is "twenty-one trillion, two billion, twenty-two million, eleven thousand, two hundred".