30021021072 has 480 divisors, whose sum is σ = 104507739648. Its totient is φ = 7851147264.

The previous prime is 30021021071. The next prime is 30021021077. The reversal of 30021021072 is 27012012003.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (30021021071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 128845468 + ... + 128845700.

Almost surely, 2^30021021072 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 30021021072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52253869824).

30021021072 is an abundant number, since it is smaller than the sum of its proper divisors (74486718576).

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

30021021072 is a wasteful number, since it uses less digits than its factorization.

30021021072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

Adding to 30021021072 its reverse (27012012003), we get a palindrome (57033033075).

The spelling of 30021021072 in words is "thirty billion, twenty-one million, twenty-one thousand, seventy-two".