21021231322200 has 144 divisors (see below), whose sum is σ = 67335752501640. Its totient is φ = 5424833740800.

The previous prime is 21021231322181. The next prime is 21021231322243. The reversal of 21021231322200 is 222313212012.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 17652009 + ... + 18805208.

Almost surely, 2^{21021231322200} is an apocalyptic number.

21021231322200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021231322200 is an abundant number, since it is smaller than the sum of its proper divisors (46314521179440).

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

21021231322200 is a wasteful number, since it uses less digits than its factorization.

21021231322200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36457298 (or 36457258 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21021231322200 its reverse (222313212012), we get a palindrome (21243544534212).

The spelling of 21021231322200 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred".