21230020201200 has 60 divisors (see below), whose sum is σ = 68006831381688. Its totient is φ = 5661338720000.

The previous prime is 21230020201163. The next prime is 21230020201211. The reversal of 21230020201200 is 210202003212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21230020201200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8845840551 + ... + 8845842950.

Almost surely, 2^{21230020201200} is an apocalyptic number.

21230020201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230020201200 is an abundant number, since it is smaller than the sum of its proper divisors (46776811180488).

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

21230020201200 is a wasteful number, since it uses less digits than its factorization.

21230020201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17691683522 (or 17691683511 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21230020201200 its reverse (210202003212), we get a palindrome (21440222204412).

The spelling of 21230020201200 in words is "twenty-one trillion, two hundred thirty billion, twenty million, two hundred one thousand, two hundred".