21242762563147 has 4 divisors (see below), whose sum is σ = 21242870008360. Its totient is φ = 21242655117936.

The previous prime is 21242762563051. The next prime is 21242762563163. The reversal of 21242762563147 is 74136526724212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21242762563147 is a prime.

It is a super-2 number, since 2×21242762563147² (a number of 27 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 = 21242762563094 and 21242762563103.

It is not an unprimeable number, because it can be changed into a prime (21242762563177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53425497 + ... + 53821642.

It is an arithmetic number, because the mean of its divisors is an integer number (5310717502090).

Almost surely, 2^{21242762563147} is an apocalyptic number.

21242762563147 is a deficient number, since it is larger than the sum of its proper divisors (107445213).

21242762563147 is a wasteful number, since it uses less digits than its factorization.

21242762563147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107445212.

The product of its digits is 6773760, while the sum is 52.

The spelling of 21242762563147 in words is "twenty-one trillion, two hundred forty-two billion, seven hundred sixty-two million, five hundred sixty-three thousand, one hundred forty-seven".