21101010321 has 8 divisors (see below), whose sum is σ = 28147460320. Its totient is φ = 14060950272.

The previous prime is 21101010251. The next prime is 21101010341. The reversal of 21101010321 is 12301010112.

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

It is not a de Polignac number, because 21101010321 - 2¹¹ = 21101008273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21101010297 and 21101010306.

It is not an unprimeable number, because it can be changed into a prime (21101010341) 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, 1589776 + ... + 1602993.

It is an arithmetic number, because the mean of its divisors is an integer number (3518432540).

Almost surely, 2^21101010321 is an apocalyptic number.

It is an amenable number.

21101010321 is a deficient number, since it is larger than the sum of its proper divisors (7046449999).

21101010321 is a wasteful number, since it uses less digits than its factorization.

21101010321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194975.

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

Adding to 21101010321 its reverse (12301010112), we get a palindrome (33402020433).

The spelling of 21101010321 in words is "twenty-one billion, one hundred one million, ten thousand, three hundred twenty-one".