21421241200 has 60 divisors (see below), whose sum is σ = 52661423848. Its totient is φ = 8369222400.

The previous prime is 21421241147. The next prime is 21421241201. The reversal of 21421241200 is 214212412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421241201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 605511 + ... + 639910.

Almost surely, 2^21421241200 is an apocalyptic number.

21421241200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421241200 is an abundant number, since it is smaller than the sum of its proper divisors (31240182648).

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

21421241200 is a wasteful number, since it uses less digits than its factorization.

21421241200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245482 (or 1245471 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21421241200 its reverse (214212412), we get a palindrome (21635453612).

21421241200 divided by its reverse (214212412) gives a square (100 = 10²).

The spelling of 21421241200 in words is "twenty-one billion, four hundred twenty-one million, two hundred forty-one thousand, two hundred".