21214036504423 has 4 divisors (see below), whose sum is σ = 24244613147920. Its totient is φ = 18183459860928.

The previous prime is 21214036504361. The next prime is 21214036504447. The reversal of 21214036504423 is 32440563041212.

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

It is a cyclic number.

It is not a de Polignac number, because 21214036504423 - 2⁹ = 21214036503911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036504723) 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, 1515288321738 + ... + 1515288321751.

It is an arithmetic number, because the mean of its divisors is an integer number (6061153286980).

Almost surely, 2^{21214036504423} is an apocalyptic number.

21214036504423 is a deficient number, since it is larger than the sum of its proper divisors (3030576643497).

21214036504423 is an equidigital number, since it uses as much as digits as its factorization.

21214036504423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030576643496.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 21214036504423 its reverse (32440563041212), we get a palindrome (53654599545635).

The spelling of 21214036504423 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred four thousand, four hundred twenty-three".