21879880221 has 8 divisors (see below), whose sum is σ = 29651422624. Its totient is φ = 14347462320.

The previous prime is 21879880171. The next prime is 21879880247. The reversal of 21879880221 is 12208897812.

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

It is not a de Polignac number, because 21879880221 - 2⁹ = 21879879709 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 (21879880261) 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, 59780911 + ... + 59781276.

It is an arithmetic number, because the mean of its divisors is an integer number (3706427828).

Almost surely, 2^21879880221 is an apocalyptic number.

It is an amenable number.

21879880221 is a deficient number, since it is larger than the sum of its proper divisors (7771542403).

21879880221 is a wasteful number, since it uses less digits than its factorization.

21879880221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119562251.

The product of its (nonzero) digits is 258048, while the sum is 48.

The spelling of 21879880221 in words is "twenty-one billion, eight hundred seventy-nine million, eight hundred eighty thousand, two hundred twenty-one".