30021420 has 96 divisors (see below), whose sum is σ = 98784000. Its totient is φ = 6716160.

The previous prime is 30021377. The next prime is 30021437. The reversal of 30021420 is 2412003.

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 = 30021396 and 30021405.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6831 + ... + 10329.

It is an arithmetic number, because the mean of its divisors is an integer number (1029000).

Almost surely, 2^30021420 is an apocalyptic number.

30021420 is a gapful number since it is divisible by the number (30) 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 30021420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49392000).

30021420 is an abundant number, since it is smaller than the sum of its proper divisors (68762580).

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

30021420 is a wasteful number, since it uses less digits than its factorization.

30021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535 (or 3533 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 30021420 is about 5479.1805956730. The cubic root of 30021420 is about 310.7971851354.

Adding to 30021420 its reverse (2412003), we get a palindrome (32433423).

The spelling of 30021420 in words is "thirty million, twenty-one thousand, four hundred twenty".