21103223101 has 4 divisors (see below), whose sum is σ = 21105928512. Its totient is φ = 21100517692.

The previous prime is 21103223033. The next prime is 21103223147. The reversal of 21103223101 is 10132230112.

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 21103223101 - 2¹⁵ = 21103190333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103223161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1340971 + ... + 1356616.

It is an arithmetic number, because the mean of its divisors is an integer number (5276482128).

Almost surely, 2^21103223101 is an apocalyptic number.

It is an amenable number.

21103223101 is a deficient number, since it is larger than the sum of its proper divisors (2705411).

21103223101 is an equidigital number, since it uses as much as digits as its factorization.

21103223101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2705410.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21103223101 its reverse (10132230112), we get a palindrome (31235453213).

The spelling of 21103223101 in words is "twenty-one billion, one hundred three million, two hundred twenty-three thousand, one hundred one".