21101002321 has 4 divisors (see below), whose sum is σ = 24115431232. Its totient is φ = 18086573412.

The previous prime is 21101002319. The next prime is 21101002337. The reversal of 21101002321 is 12320010112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101002321 - 2¹ = 21101002319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101062321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507214445 + ... + 1507214458.

It is an arithmetic number, because the mean of its divisors is an integer number (6028857808).

Almost surely, 2^21101002321 is an apocalyptic number.

It is an amenable number.

21101002321 is a deficient number, since it is larger than the sum of its proper divisors (3014428911).

21101002321 is an equidigital number, since it uses as much as digits as its factorization.

21101002321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014428910.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21101002321 its reverse (12320010112), we get a palindrome (33421012433).

The spelling of 21101002321 in words is "twenty-one billion, one hundred one million, two thousand, three hundred twenty-one".