21402328305 has 8 divisors (see below), whose sum is σ = 34243725312. Its totient is φ = 11414575088.

The previous prime is 21402328303. The next prime is 21402328307. The reversal of 21402328305 is 50382320412.

It is an interprime number because it is at equal distance from previous prime (21402328303) and next prime (21402328307).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21402328305 - 2¹ = 21402328303 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21402328303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 713410929 + ... + 713410958.

It is an arithmetic number, because the mean of its divisors is an integer number (4280465664).

Almost surely, 2^21402328305 is an apocalyptic number.

It is an amenable number.

21402328305 is a deficient number, since it is larger than the sum of its proper divisors (12841397007).

21402328305 is a wasteful number, since it uses less digits than its factorization.

21402328305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426821895.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 21402328305 its reverse (50382320412), we get a palindrome (71784648717).

The spelling of 21402328305 in words is "twenty-one billion, four hundred two million, three hundred twenty-eight thousand, three hundred five".