21450416466 has 16 divisors (see below), whose sum is σ = 43037900064. Its totient is φ = 7127294304.

The previous prime is 21450416441. The next prime is 21450416473. The reversal of 21450416466 is 66461405412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5709096 + ... + 5712851.

It is an arithmetic number, because the mean of its divisors is an integer number (2689868754).

Almost surely, 2^21450416466 is an apocalyptic number.

21450416466 is an abundant number, since it is smaller than the sum of its proper divisors (21587483598).

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

21450416466 is a wasteful number, since it uses less digits than its factorization.

21450416466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11422265.

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 21450416466 in words is "twenty-one billion, four hundred fifty million, four hundred sixteen thousand, four hundred sixty-six".