21241220000 has 480 divisors, whose sum is σ = 70228819584. Its totient is φ = 6105600000.

The previous prime is 21241219973. The next prime is 21241220003. The reversal of 21241220000 is 2214212.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241220003) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20019470 + ... + 20020530.

Almost surely, 2^21241220000 is an apocalyptic number.

21241220000 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 21241220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35114409792).

21241220000 is an abundant number, since it is smaller than the sum of its proper divisors (48987599584).

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

21241220000 is a wasteful number, since it uses less digits than its factorization.

21241220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1099 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21241220000 its reverse (2214212), we get a palindrome (21243434212).

The spelling of 21241220000 in words is "twenty-one billion, two hundred forty-one million, two hundred twenty thousand".