1012020321 has 16 divisors (see below), whose sum is σ = 1454624640. Its totient is φ = 622152960.

The previous prime is 1012020293. The next prime is 1012020341. The reversal of 1012020321 is 1230202101.

It is a de Polignac number, because none of the positive numbers 2^k-1012020321 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1012020297 and 1012020306.

It is not an unprimeable number, because it can be changed into a prime (1012020341) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27625 + ... + 52793.

It is an arithmetic number, because the mean of its divisors is an integer number (90914040).

Almost surely, 2^1012020321 is an apocalyptic number.

It is an amenable number.

1012020321 is a deficient number, since it is larger than the sum of its proper divisors (442604319).

1012020321 is a wasteful number, since it uses less digits than its factorization.

1012020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26216.

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

The square root of 1012020321 is about 31812.2668321514. The cubic root of 1012020321 is about 1003.9908257893.

Adding to 1012020321 its reverse (1230202101), we get a palindrome (2242222422).

The spelling of 1012020321 in words is "one billion, twelve million, twenty thousand, three hundred twenty-one".