21301000120 has 128 divisors (see below), whose sum is σ = 50925801600. Its totient is φ = 8002215936.

The previous prime is 21301000109. The next prime is 21301000121. The reversal of 21301000120 is 2100010312.

It is a super-2 number, since 2×21301000120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21301000097 and 21301000106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301000121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12854332 + ... + 12855988.

It is an arithmetic number, because the mean of its divisors is an integer number (397857825).

Almost surely, 2^21301000120 is an apocalyptic number.

21301000120 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 21301000120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25462900800).

21301000120 is an abundant number, since it is smaller than the sum of its proper divisors (29624801480).

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

21301000120 is a wasteful number, since it uses less digits than its factorization.

21301000120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937 (or 1933 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21301000120 its reverse (2100010312), we get a palindrome (23401010432).

The spelling of 21301000120 in words is "twenty-one billion, three hundred one million, one hundred twenty", and thus it is an aban number.