21464446506 has 8 divisors (see below), whose sum is σ = 42928893024. Its totient is φ = 7154815500.

The previous prime is 21464446489. The next prime is 21464446519. The reversal of 21464446506 is 60564446412.

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

21464446506 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1788703870 + ... + 1788703881.

It is an arithmetic number, because the mean of its divisors is an integer number (5366111628).

Almost surely, 2^21464446506 is an apocalyptic number.

21464446506 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.

21464446506 is a wasteful number, since it uses less digits than its factorization.

21464446506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577407756.

The product of its (nonzero) digits is 552960, while the sum is 42.

The spelling of 21464446506 in words is "twenty-one billion, four hundred sixty-four million, four hundred forty-six thousand, five hundred six".