21212312303200 has 72 divisors (see below), whose sum is σ = 51789005916480. Its totient is φ = 8484196032000.

The previous prime is 21212312303131. The next prime is 21212312303209. The reversal of 21212312303200 is 230321321212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212312303209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8227761 + ... + 10493839.

It is an arithmetic number, because the mean of its divisors is an integer number (719291748840).

Almost surely, 2^{21212312303200} is an apocalyptic number.

21212312303200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212312303200 is an abundant number, since it is smaller than the sum of its proper divisors (30576693613280).

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

21212312303200 is a wasteful number, since it uses less digits than its factorization.

21212312303200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277800 (or 2277787 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21212312303200 its reverse (230321321212), we get a palindrome (21442633624412).

The spelling of 21212312303200 in words is "twenty-one trillion, two hundred twelve billion, three hundred twelve million, three hundred three thousand, two hundred".