21306535466 has 8 divisors (see below), whose sum is σ = 31960428384. Its totient is φ = 10653059340.

The previous prime is 21306535463. The next prime is 21306535483. The reversal of 21306535466 is 66453560312.

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

It is not an unprimeable number, because it can be changed into a prime (21306535463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120611 + ... + 239081.

It is an arithmetic number, because the mean of its divisors is an integer number (3995053548).

Almost surely, 2^21306535466 is an apocalyptic number.

21306535466 is a deficient number, since it is larger than the sum of its proper divisors (10653892918).

21306535466 is a wasteful number, since it uses less digits than its factorization.

21306535466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208396.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21306535466 in words is "twenty-one billion, three hundred six million, five hundred thirty-five thousand, four hundred sixty-six".