21212020201200 has 120 divisors (see below), whose sum is σ = 67951854116976. Its totient is φ = 5656315392000.

The previous prime is 21212020201193. The next prime is 21212020201223. The reversal of 21212020201200 is 210202021212.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×21212020201200² (a number of 27 digits) contains 22 as substring.

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 21212020201200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31249410 + ... + 31920990.

Almost surely, 2^{21212020201200} is an apocalyptic number.

21212020201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212020201200 is an abundant number, since it is smaller than the sum of its proper divisors (46739833915776).

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

21212020201200 is a wasteful number, since it uses less digits than its factorization.

21212020201200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697923 (or 697912 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212020201200 its reverse (210202021212), we get a palindrome (21422222222412).

The spelling of 21212020201200 in words is "twenty-one trillion, two hundred twelve billion, twenty million, two hundred one thousand, two hundred".