21421224300 has 144 divisors (see below), whose sum is σ = 70898240000. Its totient is φ = 4891760640.

The previous prime is 21421224277. The next prime is 21421224311. The reversal of 21421224300 is 342212412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2618817 + ... + 2626983.

Almost surely, 2^21421224300 is an apocalyptic number.

21421224300 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 21421224300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35449120000).

21421224300 is an abundant number, since it is smaller than the sum of its proper divisors (49477015700).

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

21421224300 is a wasteful number, since it uses less digits than its factorization.

21421224300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9440 (or 9433 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21421224300 its reverse (342212412), we get a palindrome (21763436712).

The spelling of 21421224300 in words is "twenty-one billion, four hundred twenty-one million, two hundred twenty-four thousand, three hundred".