30021380 has 48 divisors (see below), whose sum is σ = 65802240. Its totient is φ = 11491200.

The previous prime is 30021377. The next prime is 30021437. The reversal of 30021380 is 8312003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110645 + ... + 110915.

It is an arithmetic number, because the mean of its divisors is an integer number (1370880).

Almost surely, 2^30021380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30021380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32901120).

30021380 is an abundant number, since it is smaller than the sum of its proper divisors (35780860).

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

30021380 is a wasteful number, since it uses less digits than its factorization.

30021380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 30021380 is about 5479.1769454910. The cubic root of 30021380 is about 310.7970471018.

Adding to 30021380 its reverse (8312003), we get a palindrome (38333383).

The spelling of 30021380 in words is "thirty million, twenty-one thousand, three hundred eighty".