21355414424371 has 4 divisors (see below), whose sum is σ = 21355424424544. Its totient is φ = 21355404424200.

The previous prime is 21355414424369. The next prime is 21355414424413. The reversal of 21355414424371 is 17342441455312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21355414424371 - 2¹ = 21355414424369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21355414424321) 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, 363915 + ... + 6545476.

It is an arithmetic number, because the mean of its divisors is an integer number (5338856106136).

Almost surely, 2^{21355414424371} is an apocalyptic number.

21355414424371 is a deficient number, since it is larger than the sum of its proper divisors (10000173).

21355414424371 is an equidigital number, since it uses as much as digits as its factorization.

21355414424371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10000172.

The product of its digits is 1612800, while the sum is 46.

Adding to 21355414424371 its reverse (17342441455312), we get a palindrome (38697855879683).

The spelling of 21355414424371 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred fourteen million, four hundred twenty-four thousand, three hundred seventy-one".