21003300120 has 512 divisors, whose sum is σ = 73761684480. Its totient is φ = 4737761280.

The previous prime is 21003300061. The next prime is 21003300173. The reversal of 21003300120 is 2100330012.

It is a happy number.

It is a super-2 number, since 2×21003300120² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21003300096 and 21003300105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 153308692 + ... + 153308828.

It is an arithmetic number, because the mean of its divisors is an integer number (144065790).

Almost surely, 2^21003300120 is an apocalyptic number.

21003300120 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 21003300120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36880842240).

21003300120 is an abundant number, since it is smaller than the sum of its proper divisors (52758384360).

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

21003300120 is a wasteful number, since it uses less digits than its factorization.

21003300120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21003300120 its reverse (2100330012), we get a palindrome (23103630132).

It can be divided in two parts, 21003 and 300120, that added together give a palindrome (321123).

The spelling of 21003300120 in words is "twenty-one billion, three million, three hundred thousand, one hundred twenty".