21868616043 has 24 divisors (see below), whose sum is σ = 33821938800. Its totient is φ = 13567302144.

The previous prime is 21868616017. The next prime is 21868616069. The reversal of 21868616043 is 34061686812.

21868616043 is a `hidden beast` number, since 21 + 8 + 6 + 8 + 616 + 0 + 4 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21868616017) and next prime (21868616069).

It is not a de Polignac number, because 21868616043 - 2⁸ = 21868615787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21868616043.

It is not an unprimeable number, because it can be changed into a prime (21868616093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 789373 + ... + 816606.

It is an arithmetic number, because the mean of its divisors is an integer number (1409247450).

Almost surely, 2^21868616043 is an apocalyptic number.

21868616043 is a deficient number, since it is larger than the sum of its proper divisors (11953322757).

21868616043 is a wasteful number, since it uses less digits than its factorization.

21868616043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606091 (or 1606088 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 21868616043 in words is "twenty-one billion, eight hundred sixty-eight million, six hundred sixteen thousand, forty-three".