21210021021200 has 120 divisors (see below), whose sum is σ = 55591210033056. Its totient is φ = 7712502784000.

The previous prime is 21210021021197. The next prime is 21210021021263. The reversal of 21210021021200 is 212012001212.

It is a super-3 number, since 3×21210021021200³ (a number of 41 digits) contains 333 as substring.

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 23 ways as a sum of consecutive naturals, for example, 226645619 + ... + 226739181.

Almost surely, 2^{21210021021200} is an apocalyptic number.

21210021021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210021021200 is an abundant number, since it is smaller than the sum of its proper divisors (34381189011856).

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

21210021021200 is a wasteful number, since it uses less digits than its factorization.

21210021021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145113 (or 145102 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210021021200 its reverse (212012001212), we get a palindrome (21422033022412).

The spelling of 21210021021200 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, twenty-one thousand, two hundred".