21023132221 has 32 divisors (see below), whose sum is σ = 27068686848. Its totient is φ = 15869779200.

The previous prime is 21023132219. The next prime is 21023132261. The reversal of 21023132221 is 12223132012.

It is not a de Polignac number, because 21023132221 - 2¹ = 21023132219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023132261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 818271 + ... + 843571.

It is an arithmetic number, because the mean of its divisors is an integer number (845896464).

Almost surely, 2^21023132221 is an apocalyptic number.

It is an amenable number.

21023132221 is a deficient number, since it is larger than the sum of its proper divisors (6045554627).

21023132221 is a wasteful number, since it uses less digits than its factorization.

21023132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25741.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21023132221 its reverse (12223132012), we get a palindrome (33246264233).

The spelling of 21023132221 in words is "twenty-one billion, twenty-three million, one hundred thirty-two thousand, two hundred twenty-one".