21415354163 has 4 divisors (see below), whose sum is σ = 24474690480. Its totient is φ = 18356017848.

The previous prime is 21415354153. The next prime is 21415354193. The reversal of 21415354163 is 36145351412.

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

It is not a de Polignac number, because 21415354163 - 2⁶ = 21415354099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21415354133) 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, 1529668148 + ... + 1529668161.

It is an arithmetic number, because the mean of its divisors is an integer number (6118672620).

Almost surely, 2^21415354163 is an apocalyptic number.

21415354163 is a deficient number, since it is larger than the sum of its proper divisors (3059336317).

21415354163 is an equidigital number, since it uses as much as digits as its factorization.

21415354163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059336316.

The product of its digits is 43200, while the sum is 35.

The spelling of 21415354163 in words is "twenty-one billion, four hundred fifteen million, three hundred fifty-four thousand, one hundred sixty-three".