21210102001200 has 480 divisors, whose sum is σ = 78608984702976. Its totient is φ = 4788345185280.

The previous prime is 21210102001189. The next prime is 21210102001237. The reversal of 21210102001200 is 210020101212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 331339597 + ... + 331403603.

Almost surely, 2^{21210102001200} is an apocalyptic number.

21210102001200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210102001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39304492351488).

21210102001200 is an abundant number, since it is smaller than the sum of its proper divisors (57398882701776).

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

21210102001200 is a wasteful number, since it uses less digits than its factorization.

21210102001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64521 (or 64510 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210102001200 its reverse (210020101212), we get a palindrome (21420122102412).

The spelling of 21210102001200 in words is "twenty-one trillion, two hundred ten billion, one hundred two million, one thousand, two hundred".