21344410109 has 4 divisors (see below), whose sum is σ = 23284811040. Its totient is φ = 19404009180.

The previous prime is 21344410091. The next prime is 21344410123. The reversal of 21344410109 is 90101444312.

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 21344410109 - 2¹⁶ = 21344344573 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 (21344400109) 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, 970200449 + ... + 970200470.

It is an arithmetic number, because the mean of its divisors is an integer number (5821202760).

Almost surely, 2^21344410109 is an apocalyptic number.

It is an amenable number.

21344410109 is a deficient number, since it is larger than the sum of its proper divisors (1940400931).

21344410109 is a wasteful number, since it uses less digits than its factorization.

21344410109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940400930.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21344410109 in words is "twenty-one billion, three hundred forty-four million, four hundred ten thousand, one hundred nine".