20032001021 has 8 divisors (see below), whose sum is σ = 20602781784. Its totient is φ = 19462766400.

The previous prime is 20032000993. The next prime is 20032001057. The reversal of 20032001021 is 12010023002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6010125625 + 14021875396 = 77525^2 + 118414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20032001021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20032000993 and 20032001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20032001071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360230 + ... + 412103.

It is an arithmetic number, because the mean of its divisors is an integer number (2575347723).

Almost surely, 2^20032001021 is an apocalyptic number.

It is an amenable number.

20032001021 is a deficient number, since it is larger than the sum of its proper divisors (570780763).

20032001021 is an equidigital number, since it uses as much as digits as its factorization.

20032001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773071.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20032001021 its reverse (12010023002), we get a palindrome (32042024023).

The spelling of 20032001021 in words is "twenty billion, thirty-two million, one thousand, twenty-one".