12021031020 has 24 divisors (see below), whose sum is σ = 33658887024. Its totient is φ = 3205608256.

The previous prime is 12021031013. The next prime is 12021031031. The reversal of 12021031020 is 2013012021.

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 = 12021030987 and 12021031005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100175199 + ... + 100175318.

It is an arithmetic number, because the mean of its divisors is an integer number (1402453626).

Almost surely, 2^12021031020 is an apocalyptic number.

12021031020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021031020 is an abundant number, since it is smaller than the sum of its proper divisors (21637856004).

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

12021031020 is a wasteful number, since it uses less digits than its factorization.

12021031020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200350529 (or 200350527 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 12021031020 its reverse (2013012021), we get a palindrome (14034043041).

The spelling of 12021031020 in words is "twelve billion, twenty-one million, thirty-one thousand, twenty".