12021000030 has 48 divisors (see below), whose sum is σ = 33658803360. Its totient is φ = 2959015104.

The previous prime is 12021000007. The next prime is 12021000031. The reversal of 12021000030 is 3000012021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12020999976 and 12021000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021000031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5136010 + ... + 5138349.

It is an arithmetic number, because the mean of its divisors is an integer number (701225070).

Almost surely, 2^12021000030 is an apocalyptic number.

12021000030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12021000030 is an abundant number, since it is smaller than the sum of its proper divisors (21637803330).

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

12021000030 is a wasteful number, since it uses less digits than its factorization.

12021000030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10274385 (or 10274382 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 12021000030 its reverse (3000012021), we get a palindrome (15021012051).

The spelling of 12021000030 in words is "twelve billion, twenty-one million, thirty", and thus it is an aban number and an uban number.