21020132321 has 8 divisors (see below), whose sum is σ = 21878374080. Its totient is φ = 20170784592.

The previous prime is 21020132291. The next prime is 21020132323. The reversal of 21020132321 is 12323102012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020132321 - 2¹⁴ = 21020115937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21020132321.

It is not an unprimeable number, because it can be changed into a prime (21020132323) 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, 2218685 + ... + 2228138.

It is an arithmetic number, because the mean of its divisors is an integer number (2734796760).

Almost surely, 2^21020132321 is an apocalyptic number.

It is an amenable number.

21020132321 is a deficient number, since it is larger than the sum of its proper divisors (858241759).

21020132321 is a wasteful number, since it uses less digits than its factorization.

21020132321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4447015.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21020132321 its reverse (12323102012), we get a palindrome (33343234333).

The spelling of 21020132321 in words is "twenty-one billion, twenty million, one hundred thirty-two thousand, three hundred twenty-one".