21174813648 has 30 divisors (see below), whose sum is σ = 59260069154. Its totient is φ = 7058271168.

The previous prime is 21174813601. The next prime is 21174813677. The reversal of 21174813648 is 84631847112.

21174813648 is a `hidden beast` number, since 211 + 74 + 8 + 1 + 364 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19691947584 + 1482866064 = 140328^2 + 38508^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73523515 + ... + 73523802.

Almost surely, 2^21174813648 is an apocalyptic number.

It is an amenable number.

21174813648 is an abundant number, since it is smaller than the sum of its proper divisors (38085255506).

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

21174813648 is a wasteful number, since it uses less digits than its factorization.

21174813648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147047331 (or 147047322 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The spelling of 21174813648 in words is "twenty-one billion, one hundred seventy-four million, eight hundred thirteen thousand, six hundred forty-eight".