21880385398 has 8 divisors (see below), whose sum is σ = 34751200392. Its totient is φ = 10296651936.

The previous prime is 21880385339. The next prime is 21880385413. The reversal of 21880385398 is 89358308812.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321770340 + ... + 321770407.

It is an arithmetic number, because the mean of its divisors is an integer number (4343900049).

Almost surely, 2^21880385398 is an apocalyptic number.

21880385398 is a deficient number, since it is larger than the sum of its proper divisors (12870814994).

21880385398 is a wasteful number, since it uses less digits than its factorization.

21880385398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643540766.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 21880385398 in words is "twenty-one billion, eight hundred eighty million, three hundred eighty-five thousand, three hundred ninety-eight".