21614165455 has 4 divisors (see below), whose sum is σ = 25936998552. Its totient is φ = 17291332360.

The previous prime is 21614165453. The next prime is 21614165459. The reversal of 21614165455 is 55456141612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21614165455 - 2¹ = 21614165453 is a prime.

It is a super-2 number, since 2×21614165455² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21614165453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2161416541 + ... + 2161416550.

It is an arithmetic number, because the mean of its divisors is an integer number (6484249638).

Almost surely, 2^21614165455 is an apocalyptic number.

21614165455 is a deficient number, since it is larger than the sum of its proper divisors (4322833097).

21614165455 is an equidigital number, since it uses as much as digits as its factorization.

21614165455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4322833096.

The product of its digits is 144000, while the sum is 40.

The spelling of 21614165455 in words is "twenty-one billion, six hundred fourteen million, one hundred sixty-five thousand, four hundred fifty-five".