21064473600 has 132 divisors (see below), whose sum is σ = 69619436184. Its totient is φ = 5617172480.

The previous prime is 21064473569. The next prime is 21064473601. The reversal of 21064473600 is 637446012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064473601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60339 + ... + 213938.

Almost surely, 2^21064473600 is an apocalyptic number.

21064473600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21064473600 is an abundant number, since it is smaller than the sum of its proper divisors (48554962584).

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

21064473600 is a wasteful number, since it uses less digits than its factorization.

21064473600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274310 (or 274287 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The spelling of 21064473600 in words is "twenty-one billion, sixty-four million, four hundred seventy-three thousand, six hundred".