21647450241 has 6 divisors (see below), whose sum is σ = 31268539250. Its totient is φ = 14431633488.

The previous prime is 21647450197. The next prime is 21647450269. The reversal of 21647450241 is 14205474612.

21647450241 is a `hidden beast` number, since 2 + 1 + 647 + 4 + 5 + 0 + 2 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17796627216 + 3850823025 = 133404^2 + 62055^2 .

It is not a de Polignac number, because 21647450241 - 2¹⁰ = 21647449217 is a prime.

It is a super-2 number, since 2×21647450241² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21647450196 and 21647450205.

It is not an unprimeable number, because it can be changed into a prime (21647458241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1202636116 + ... + 1202636133.

Almost surely, 2^21647450241 is an apocalyptic number.

It is an amenable number.

21647450241 is a deficient number, since it is larger than the sum of its proper divisors (9621089009).

21647450241 is a wasteful number, since it uses less digits than its factorization.

21647450241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405272255 (or 2405272252 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 21647450241 in words is "twenty-one billion, six hundred forty-seven million, four hundred fifty thousand, two hundred forty-one".