21400311405 has 16 divisors (see below), whose sum is σ = 37353271104. Its totient is φ = 10375908480.

The previous prime is 21400311389. The next prime is 21400311481. The reversal of 21400311405 is 50411300412.

It is not a de Polignac number, because 21400311405 - 2⁴ = 21400311389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64849264 + ... + 64849593.

It is an arithmetic number, because the mean of its divisors is an integer number (2334579444).

Almost surely, 2^21400311405 is an apocalyptic number.

It is an amenable number.

21400311405 is a deficient number, since it is larger than the sum of its proper divisors (15952959699).

21400311405 is a wasteful number, since it uses less digits than its factorization.

21400311405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129698876.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21400311405 its reverse (50411300412), we get a palindrome (71811611817).

The spelling of 21400311405 in words is "twenty-one billion, four hundred million, three hundred eleven thousand, four hundred five".