21100320132221 has 4 divisors (see below), whose sum is σ = 23018531053344. Its totient is φ = 19182109211100.

The previous prime is 21100320132217. The next prime is 21100320132223. The reversal of 21100320132221 is 12223102300112.

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 not a de Polignac number, because 21100320132221 - 2² = 21100320132217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100320132193 and 21100320132202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100320132223) 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, 959105460545 + ... + 959105460566.

It is an arithmetic number, because the mean of its divisors is an integer number (5754632763336).

Almost surely, 2^{21100320132221} is an apocalyptic number.

It is an amenable number.

21100320132221 is a deficient number, since it is larger than the sum of its proper divisors (1918210921123).

21100320132221 is a wasteful number, since it uses less digits than its factorization.

21100320132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918210921122.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21100320132221 its reverse (12223102300112), we get a palindrome (33323422432333).

The spelling of 21100320132221 in words is "twenty-one trillion, one hundred billion, three hundred twenty million, one hundred thirty-two thousand, two hundred twenty-one".