21221011001200 has 30 divisors (see below), whose sum is σ = 50983478931344. Its totient is φ = 8488404400320.

The previous prime is 21221011001173. The next prime is 21221011001213. The reversal of 21221011001200 is 210011012212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26526263352 + ... + 26526264151.

Almost surely, 2^{21221011001200} is an apocalyptic number.

21221011001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221011001200 is an abundant number, since it is smaller than the sum of its proper divisors (29762467930144).

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

21221011001200 is a wasteful number, since it uses less digits than its factorization.

21221011001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53052527521 (or 53052527510 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21221011001200 its reverse (210011012212), we get a palindrome (21431022013412).

The spelling of 21221011001200 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one thousand, two hundred".