21101103332321 has 4 divisors (see below), whose sum is σ = 21235505264532. Its totient is φ = 20966701400112.

The previous prime is 21101103332251. The next prime is 21101103332341. The reversal of 21101103332321 is 12323330110112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14783602053025 + 6317501279296 = 3844945^2 + 2513464^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101103332321 - 2²⁶ = 21101036223457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101103332341) 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, 67200965870 + ... + 67200966183.

It is an arithmetic number, because the mean of its divisors is an integer number (5308876316133).

Almost surely, 2^{21101103332321} is an apocalyptic number.

It is an amenable number.

21101103332321 is a deficient number, since it is larger than the sum of its proper divisors (134401932211).

21101103332321 is a wasteful number, since it uses less digits than its factorization.

21101103332321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134401932210.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21101103332321 its reverse (12323330110112), we get a palindrome (33424433442433).

The spelling of 21101103332321 in words is "twenty-one trillion, one hundred one billion, one hundred three million, three hundred thirty-two thousand, three hundred twenty-one".