21210231120 has 320 divisors, whose sum is σ = 74650222080. Its totient is φ = 4944715776.

The previous prime is 21210231089. The next prime is 21210231121. The reversal of 21210231120 is 2113201212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21210231120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210231121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4793229 + ... + 4797651.

It is an arithmetic number, because the mean of its divisors is an integer number (233281944).

Almost surely, 2^21210231120 is an apocalyptic number.

21210231120 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 21210231120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37325111040).

21210231120 is an abundant number, since it is smaller than the sum of its proper divisors (53439990960).

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

21210231120 is a wasteful number, since it uses less digits than its factorization.

21210231120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4534 (or 4528 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21210231120 its reverse (2113201212), we get a palindrome (23323432332).

The spelling of 21210231120 in words is "twenty-one billion, two hundred ten million, two hundred thirty-one thousand, one hundred twenty".