21010032133221 has 16 divisors (see below), whose sum is σ = 28717253886464. Its totient is φ = 13655940231024.

The previous prime is 21010032133201. The next prime is 21010032133247. The reversal of 21010032133221 is 12233123001012.

It is not a de Polignac number, because 21010032133221 - 2⁹ = 21010032132709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010032133201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148803721 + ... + 148944846.

It is an arithmetic number, because the mean of its divisors is an integer number (1794828367904).

Almost surely, 2^{21010032133221} is an apocalyptic number.

It is an amenable number.

21010032133221 is a deficient number, since it is larger than the sum of its proper divisors (7707221753243).

21010032133221 is a wasteful number, since it uses less digits than its factorization.

21010032133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297749160.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21010032133221 its reverse (12233123001012), we get a palindrome (33243155134233).

The spelling of 21010032133221 in words is "twenty-one trillion, ten billion, thirty-two million, one hundred thirty-three thousand, two hundred twenty-one".