21869984455 has 32 divisors (see below), whose sum is σ = 30339489600. Its totient is φ = 14982374400.

The previous prime is 21869984453. The next prime is 21869984467. The reversal of 21869984455 is 55448996812.

It is not a de Polignac number, because 21869984455 - 2¹ = 21869984453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21869984393 and 21869984402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21869984453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101820 + ... + 232609.

It is an arithmetic number, because the mean of its divisors is an integer number (948109050).

Almost surely, 2^21869984455 is an apocalyptic number.

21869984455 is a deficient number, since it is larger than the sum of its proper divisors (8469505145).

21869984455 is a wasteful number, since it uses less digits than its factorization.

21869984455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334515.

The product of its digits is 24883200, while the sum is 61.

The spelling of 21869984455 in words is "twenty-one billion, eight hundred sixty-nine million, nine hundred eighty-four thousand, four hundred fifty-five".