21884313855 has 8 divisors (see below), whose sum is σ = 35014902192. Its totient is φ = 11671634048.

The previous prime is 21884313839. The next prime is 21884313859. The reversal of 21884313855 is 55831348812.

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

It is a cyclic number.

It is not a de Polignac number, because 21884313855 - 2⁴ = 21884313839 is a prime.

It is a super-2 number, since 2×21884313855² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884313859) 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, 729477114 + ... + 729477143.

It is an arithmetic number, because the mean of its divisors is an integer number (4376862774).

Almost surely, 2^21884313855 is an apocalyptic number.

21884313855 is a deficient number, since it is larger than the sum of its proper divisors (13130588337).

21884313855 is a wasteful number, since it uses less digits than its factorization.

21884313855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458954265.

The product of its digits is 921600, while the sum is 48.

The spelling of 21884313855 in words is "twenty-one billion, eight hundred eighty-four million, three hundred thirteen thousand, eight hundred fifty-five".