21306550135 has 16 divisors (see below), whose sum is σ = 28731777984. Its totient is φ = 15049976832.

The previous prime is 21306550123. The next prime is 21306550141. The reversal of 21306550135 is 53105560312.

It is a cyclic number.

It is not a de Polignac number, because 21306550135 - 2⁹ = 21306549623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21306550097 and 21306550106.

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, 7124442 + ... + 7127431.

It is an arithmetic number, because the mean of its divisors is an integer number (1795736124).

Almost surely, 2^21306550135 is an apocalyptic number.

21306550135 is a deficient number, since it is larger than the sum of its proper divisors (7425227849).

21306550135 is a wasteful number, since it uses less digits than its factorization.

21306550135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14251914.

The product of its (nonzero) digits is 13500, while the sum is 31.

The spelling of 21306550135 in words is "twenty-one billion, three hundred six million, five hundred fifty thousand, one hundred thirty-five".