21741242256 has 60 divisors (see below), whose sum is σ = 61053063708. Its totient is φ = 7222332672.

The previous prime is 21741242239. The next prime is 21741242267. The reversal of 21741242256 is 65224214712.

21741242256 is a `hidden beast` number, since 2 + 17 + 412 + 4 + 225 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8745242256 + 12996000000 = 93516^2 + 114000^2 .

It is a super-2 number, since 2×21741242256² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21741242256.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215455 + ... + 299838.

Almost surely, 2^21741242256 is an apocalyptic number.

It is an amenable number.

21741242256 is an abundant number, since it is smaller than the sum of its proper divisors (39311821452).

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

21741242256 is a wasteful number, since it uses less digits than its factorization.

21741242256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515600 (or 515591 counting only the distinct ones).

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

Adding to 21741242256 its reverse (65224214712), we get a palindrome (86965456968).

The spelling of 21741242256 in words is "twenty-one billion, seven hundred forty-one million, two hundred forty-two thousand, two hundred fifty-six".