21647865348 has 144 divisors (see below), whose sum is σ = 59675616000. Its totient is φ = 6590997504.

The previous prime is 21647865341. The next prime is 21647865361. The reversal of 21647865348 is 84356874612.

It is a happy number.

21647865348 is a `hidden beast` number, since 21 + 6 + 4 + 7 + 86 + 534 + 8 = 666.

It is a super-2 number, since 2×21647865348² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21647865294 and 21647865303.

It is not an unprimeable number, because it can be changed into a prime (21647865341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2848738 + ... + 2856326.

It is an arithmetic number, because the mean of its divisors is an integer number (414414000).

Almost surely, 2^21647865348 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21647865348, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29837808000).

21647865348 is an abundant number, since it is smaller than the sum of its proper divisors (38027750652).

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

21647865348 is a wasteful number, since it uses less digits than its factorization.

21647865348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7754 (or 7749 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 21647865348 in words is "twenty-one billion, six hundred forty-seven million, eight hundred sixty-five thousand, three hundred forty-eight".