21051213201200 has 240 divisors, whose sum is σ = 62252926766016. Its totient is φ = 6661708185600.

The previous prime is 21051213201131. The next prime is 21051213201211. The reversal of 21051213201200 is 210231215012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 484571480 + ... + 484614920.

Almost surely, 2^{21051213201200} is an apocalyptic number.

21051213201200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21051213201200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31126463383008).

21051213201200 is an abundant number, since it is smaller than the sum of its proper divisors (41201713564816).

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

21051213201200 is a wasteful number, since it uses less digits than its factorization.

21051213201200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56792 (or 56781 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

Adding to 21051213201200 its reverse (210231215012), we get a palindrome (21261444416212).

The spelling of 21051213201200 in words is "twenty-one trillion, fifty-one billion, two hundred thirteen million, two hundred one thousand, two hundred".