21236630466 has 8 divisors (see below), whose sum is σ = 42473260944. Its totient is φ = 7078876820.

The previous prime is 21236630407. The next prime is 21236630497. The reversal of 21236630466 is 66403663212.

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

21236630466 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1769719200 + ... + 1769719211.

It is an arithmetic number, because the mean of its divisors is an integer number (5309157618).

Almost surely, 2^21236630466 is an apocalyptic number.

21236630466 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21236630466 is a wasteful number, since it uses less digits than its factorization.

21236630466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539438416.

The product of its (nonzero) digits is 186624, while the sum is 39.

The spelling of 21236630466 in words is "twenty-one billion, two hundred thirty-six million, six hundred thirty thousand, four hundred sixty-six".