21030030120 has 256 divisors, whose sum is σ = 69908417280. Its totient is φ = 5018624000.

The previous prime is 21030030107. The next prime is 21030030157. The reversal of 21030030120 is 2103003012.

It is a happy number.

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 = 21030030096 and 21030030105.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31063222 + ... + 31063898.

It is an arithmetic number, because the mean of its divisors is an integer number (273079755).

Almost surely, 2^21030030120 is an apocalyptic number.

21030030120 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 21030030120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34954208640).

21030030120 is an abundant number, since it is smaller than the sum of its proper divisors (48878387160).

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

21030030120 is a wasteful number, since it uses less digits than its factorization.

21030030120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036 (or 1032 counting only the distinct ones).

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

Adding to 21030030120 its reverse (2103003012), we get a palindrome (23133033132).

The spelling of 21030030120 in words is "twenty-one billion, thirty million, thirty thousand, one hundred twenty".