21214204223 has 4 divisors (see below), whose sum is σ = 21214697760. Its totient is φ = 21213710688.

The previous prime is 21214204217. The next prime is 21214204337. The reversal of 21214204223 is 32240241212.

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 21214204223 - 2¹² = 21214200127 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 (21214204213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175415 + ... + 270552.

It is an arithmetic number, because the mean of its divisors is an integer number (5303674440).

Almost surely, 2^21214204223 is an apocalyptic number.

21214204223 is a deficient number, since it is larger than the sum of its proper divisors (493537).

21214204223 is an equidigital number, since it uses as much as digits as its factorization.

21214204223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493536.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21214204223 its reverse (32240241212), we get a palindrome (53454445435).

The spelling of 21214204223 in words is "twenty-one billion, two hundred fourteen million, two hundred four thousand, two hundred twenty-three".