21234404101 has 4 divisors (see below), whose sum is σ = 21234930732. Its totient is φ = 21233877472.

The previous prime is 21234404069. The next prime is 21234404119. The reversal of 21234404101 is 10140443212.

It is a happy number.

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 2908013476 + 18326390625 = 53926^2 + 135375^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234404101 - 2⁵ = 21234404069 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 (21234404131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197320 + ... + 285313.

It is an arithmetic number, because the mean of its divisors is an integer number (5308732683).

Almost surely, 2^21234404101 is an apocalyptic number.

It is an amenable number.

21234404101 is a deficient number, since it is larger than the sum of its proper divisors (526631).

21234404101 is an equidigital number, since it uses as much as digits as its factorization.

21234404101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526630.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21234404101 its reverse (10140443212), we get a palindrome (31374847313).

The spelling of 21234404101 in words is "twenty-one billion, two hundred thirty-four million, four hundred four thousand, one hundred one".