21899356863 has 8 divisors (see below), whose sum is σ = 29200003248. Its totient is φ = 14599140864.

The previous prime is 21899356847. The next prime is 21899356883. The reversal of 21899356863 is 36865399812.

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

It is not a de Polignac number, because 21899356863 - 2⁴ = 21899356847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21899356797 and 21899356806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21899356823) 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, 40095 + ... + 213087.

It is an arithmetic number, because the mean of its divisors is an integer number (3650000406).

Almost surely, 2^21899356863 is an apocalyptic number.

21899356863 is a deficient number, since it is larger than the sum of its proper divisors (7300646385).

21899356863 is a wasteful number, since it uses less digits than its factorization.

21899356863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215193.

The product of its digits is 16796160, while the sum is 60.

The spelling of 21899356863 in words is "twenty-one billion, eight hundred ninety-nine million, three hundred fifty-six thousand, eight hundred sixty-three".