21212202101200 has 120 divisors (see below), whose sum is σ = 55596865233600. Its totient is φ = 7713304396800.

The previous prime is 21212202101173. The next prime is 21212202101219. The reversal of 21212202101200 is 210120221212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 272439876 + ... + 272517724.

It is an arithmetic number, because the mean of its divisors is an integer number (463307210280).

Almost surely, 2^{21212202101200} is an apocalyptic number.

21212202101200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212202101200 is an abundant number, since it is smaller than the sum of its proper divisors (34384663132400).

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

21212202101200 is a wasteful number, since it uses less digits than its factorization.

21212202101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139805 (or 139794 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212202101200 its reverse (210120221212), we get a palindrome (21422322322412).

The spelling of 21212202101200 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred one thousand, two hundred".