21068878423 has 8 divisors (see below), whose sum is σ = 21681411840. Its totient is φ = 20463189240.

The previous prime is 21068878387. The next prime is 21068878433. The reversal of 21068878423 is 32487886012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21068878423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068878433) 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, 1704813 + ... + 1717126.

It is an arithmetic number, because the mean of its divisors is an integer number (2710176480).

Almost surely, 2^21068878423 is an apocalyptic number.

21068878423 is a deficient number, since it is larger than the sum of its proper divisors (612533417).

21068878423 is a wasteful number, since it uses less digits than its factorization.

21068878423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422117.

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 21068878423 in words is "twenty-one billion, sixty-eight million, eight hundred seventy-eight thousand, four hundred twenty-three".