21888673867 has 4 divisors (see below), whose sum is σ = 23176242936. Its totient is φ = 20601104800.

The previous prime is 21888673847. The next prime is 21888673871. The reversal of 21888673867 is 76837688812.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21888673867 - 2³¹ = 19741190219 is a prime.

It is a super-2 number, since 2×21888673867² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21888673799 and 21888673808.

It is not an unprimeable number, because it can be changed into a prime (21888673837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643784509 + ... + 643784542.

It is an arithmetic number, because the mean of its divisors is an integer number (5794060734).

Almost surely, 2^21888673867 is an apocalyptic number.

21888673867 is a deficient number, since it is larger than the sum of its proper divisors (1287569069).

21888673867 is a wasteful number, since it uses less digits than its factorization.

21888673867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287569068.

The product of its digits is 43352064, while the sum is 64.

The spelling of 21888673867 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred sixty-seven".