21160473664 has 56 divisors (see below), whose sum is σ = 46584108000. Its totient is φ = 9455354880.

The previous prime is 21160473647. The next prime is 21160473673. The reversal of 21160473664 is 46637406112.

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, 213189 + ... + 296260.

Almost surely, 2^21160473664 is an apocalyptic number.

It is an amenable number.

21160473664 is an abundant number, since it is smaller than the sum of its proper divisors (25423634336).

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

21160473664 is a wasteful number, since it uses less digits than its factorization.

21160473664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509531 (or 509521 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

Adding to 21160473664 its reverse (46637406112), we get a palindrome (67797879776).

The spelling of 21160473664 in words is "twenty-one billion, one hundred sixty million, four hundred seventy-three thousand, six hundred sixty-four".