21868001742 has 16 divisors (see below), whose sum is σ = 43737857280. Its totient is φ = 7289024952.

The previous prime is 21868001717. The next prime is 21868001747. The reversal of 21868001742 is 24710086812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21868001742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868001747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111643 + ... + 237065.

It is an arithmetic number, because the mean of its divisors is an integer number (2733616080).

Almost surely, 2^21868001742 is an apocalyptic number.

21868001742 is an abundant number, since it is smaller than the sum of its proper divisors (21869855538).

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

21868001742 is a wasteful number, since it uses less digits than its factorization.

21868001742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154487.

The product of its (nonzero) digits is 43008, while the sum is 39.

The spelling of 21868001742 in words is "twenty-one billion, eight hundred sixty-eight million, one thousand, seven hundred forty-two".