21235121200 has 60 divisors (see below), whose sum is σ = 51061012888. Its totient is φ = 8486784000.

The previous prime is 21235121137. The next prime is 21235121227. The reversal of 21235121200 is 212153212.

It is a super-3 number, since 3×21235121200³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 458299 + ... + 502501.

Almost surely, 2^21235121200 is an apocalyptic number.

21235121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21235121200 is an abundant number, since it is smaller than the sum of its proper divisors (29825891688).

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

21235121200 is a wasteful number, since it uses less digits than its factorization.

21235121200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45422 (or 45411 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21235121200 its reverse (212153212), we get a palindrome (21447274412).

The spelling of 21235121200 in words is "twenty-one billion, two hundred thirty-five million, one hundred twenty-one thousand, two hundred".