21032001021 has 32 divisors (see below), whose sum is σ = 29726945280. Its totient is φ = 13198958784.

The previous prime is 21032001007. The next prime is 21032001031. The reversal of 21032001021 is 12010023012.

It is not a de Polignac number, because 21032001021 - 2⁷ = 21032000893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21032000988 and 21032001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032001031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8269276 + ... + 8271818.

It is an arithmetic number, because the mean of its divisors is an integer number (928967040).

Almost surely, 2^21032001021 is an apocalyptic number.

It is an amenable number.

21032001021 is a deficient number, since it is larger than the sum of its proper divisors (8694944259).

21032001021 is a wasteful number, since it uses less digits than its factorization.

21032001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425.

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

Adding to 21032001021 its reverse (12010023012), we get a palindrome (33042024033).

The spelling of 21032001021 in words is "twenty-one billion, thirty-two million, one thousand, twenty-one".