21468319506 has 24 divisors (see below), whose sum is σ = 46518823260. Its totient is φ = 7155470976.

The previous prime is 21468319489. The next prime is 21468319529. The reversal of 21468319506 is 60591386412.

21468319506 is a `hidden beast` number, since 21 + 46 + 83 + 1 + 9 + 506 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21080426481 + 387893025 = 145191^2 + 19695^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184006 + ... + 277118.

Almost surely, 2^21468319506 is an apocalyptic number.

21468319506 is an abundant number, since it is smaller than the sum of its proper divisors (25050503754).

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

21468319506 is a wasteful number, since it uses less digits than its factorization.

21468319506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105930 (or 105927 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 21468319506 in words is "twenty-one billion, four hundred sixty-eight million, three hundred nineteen thousand, five hundred six".