21103232101 has 4 divisors (see below), whose sum is σ = 24117979552. Its totient is φ = 18088484652.

The previous prime is 21103232027. The next prime is 21103232107. The reversal of 21103232101 is 10123230112.

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 21103232101 - 2¹⁵ = 21103199333 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 (21103232107) 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, 1507373715 + ... + 1507373728.

It is an arithmetic number, because the mean of its divisors is an integer number (6029494888).

Almost surely, 2^21103232101 is an apocalyptic number.

It is an amenable number.

21103232101 is a deficient number, since it is larger than the sum of its proper divisors (3014747451).

21103232101 is an equidigital number, since it uses as much as digits as its factorization.

21103232101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3014747450.

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

Adding to 21103232101 its reverse (10123230112), we get a palindrome (31226462213).

The spelling of 21103232101 in words is "twenty-one billion, one hundred three million, two hundred thirty-two thousand, one hundred one".