21402344244101 has 4 divisors (see below), whose sum is σ = 21405371885100. Its totient is φ = 21399316603104.

The previous prime is 21402344244031. The next prime is 21402344244107. The reversal of 21402344244101 is 10144244320412.

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 10894957164001 + 10507387080100 = 3300751^2 + 3241510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21402344244101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402344244107) 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, 1513809896 + ... + 1513824033.

It is an arithmetic number, because the mean of its divisors is an integer number (5351342971275).

Almost surely, 2^{21402344244101} is an apocalyptic number.

It is an amenable number.

21402344244101 is a deficient number, since it is larger than the sum of its proper divisors (3027640999).

21402344244101 is an equidigital number, since it uses as much as digits as its factorization.

21402344244101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3027640998.

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 21402344244101 its reverse (10144244320412), we get a palindrome (31546588564513).

The spelling of 21402344244101 in words is "twenty-one trillion, four hundred two billion, three hundred forty-four million, two hundred forty-four thousand, one hundred one".