21010032332221 has 16 divisors (see below), whose sum is σ = 21902579899200. Its totient is φ = 20136071491200.

The previous prime is 21010032332213. The next prime is 21010032332243. The reversal of 21010032332221 is 12223323001012.

It is a cyclic number.

It is not a de Polignac number, because 21010032332221 - 2³ = 21010032332213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010032332192 and 21010032332201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010032332251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417766 + ... + 6495736.

It is an arithmetic number, because the mean of its divisors is an integer number (1368911243700).

Almost surely, 2^{21010032332221} is an apocalyptic number.

It is an amenable number.

21010032332221 is a deficient number, since it is larger than the sum of its proper divisors (892547566979).

21010032332221 is a wasteful number, since it uses less digits than its factorization.

21010032332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6079500.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21010032332221 its reverse (12223323001012), we get a palindrome (33233355333233).

The spelling of 21010032332221 in words is "twenty-one trillion, ten billion, thirty-two million, three hundred thirty-two thousand, two hundred twenty-one".