21412078305 has 16 divisors (see below), whose sum is σ = 34261816320. Its totient is φ = 11418944768.

The previous prime is 21412078277. The next prime is 21412078309. The reversal of 21412078305 is 50387021412.

It is a cyclic number.

It is not a de Polignac number, because 21412078305 - 2⁶ = 21412078241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21412078309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201049 + ... + 288521.

It is an arithmetic number, because the mean of its divisors is an integer number (2141363520).

Almost surely, 2^21412078305 is an apocalyptic number.

It is an amenable number.

21412078305 is a deficient number, since it is larger than the sum of its proper divisors (12849738015).

21412078305 is a wasteful number, since it uses less digits than its factorization.

21412078305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103800.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 21412078305 its reverse (50387021412), we get a palindrome (71799099717).

The spelling of 21412078305 in words is "twenty-one billion, four hundred twelve million, seventy-eight thousand, three hundred five".